Программирование на языке C в Microsoft Visual Studio 2010 - ответы

typedef union pw_union {  short int i;  char ch[2];} pw;int putw(short int num, FILE *fp);int main(void){  FILE *fp;  fp = fopen("g:\\test.tmp", "wb+");  if(fp == NULL) {    printf("Файл не открыт.\n");    exit(1);  }  putw(1025, fp);  fclose(fp);  return 0;}int putw(short int num, FILE *fp){  pw_union word;  word.i = num;  putc(word.ch[0], fp);   return putc(word.ch[1], fp); }

#include <stdio.h>#include <stdarg.h>int average(int first, ... );int main( void ){	int x;	<Вызов фукнции average()>;	return 0;}int average( int first, ... ){   int count = 0, sum = 0, i = first;   va_list marker;   va_start(marker, first);   while( i != -1 ) {      sum += i;      count++;      i = va_arg(marker, int);   }   va_end(marker);   return( sum ? (sum / count) : 0 );}

#include <stdio.h>#include <math.h>#include <time.h>#include <string.h>void AddToLog(FILE*, char*);char* GenerateFileName();int main (void) {	FILE *fp;	char *strFile, strFn[30] = "";	double (*pFunc) (double);	int c = 1;	double y;	strFile = GenerateFileName();	strcpy(strFn, strFile);	if( (fp = fopen(strFn, "a+")) == NULL )		printf( "Problem opening the file\n" );	while(1) {		printf("Выберите функцию (0-выход): 1-sqrt, 2-sin, 3-tan\n");		scanf("%d", &c);		switch(c) {			case 1: 				pFunc = sqrt; 				AddToLog(fp, "Пользователь выбрал функцию 1 (вычисление квадратного корня)\n");				break;			case 2: 				pFunc = sin; 				AddToLog(fp, "Пользователь выбрал функцию 2 (вычисление синуса)\n");				break;			case 3: 				pFunc = tan; 				AddToLog(fp, "Пользователь выбрал функцию 3 (вычисление тангенса)\n");				break;			case 0: 				AddToLog(fp, "Пользователь завершил выбор функции\n\n");				printf("Лог сохранен в файл %s\n", strFn);				return;			default: 				AddToLog(fp, "Пользователь задал неверный номер функции\n\n");				continue;		}			y = pFunc(1.1);		AddToLog(fp, "Вычислено значение выбранной функции\n");		printf("f(1.1) = %.2f\n", y);		AddToLog(fp, "Результат вычисления выведен на экран\n");	}	if (fp != NULL) fclose(fp);		return 0;}void AddToLog(FILE *fp, char *str){	if (fp != NULL) fputs(str, fp);}char* GenerateFileName(){	char strTime[10] = "";	char strDate[10] = "";	char strFile[30] = "g:\\log_";	char *token;	_strdate(strDate);	_strtime(strTime);	token = strtok(strDate, "/");	while( token != NULL ) {		strncat(strFile,token,2);		token = strtok( NULL, "/" );	}	strncat(strFile,"_",1);	token = strtok(strTime, ":");	while( token != NULL ) {		strncat(strFile,token,2);		token = strtok( NULL, "/" );	}	strncat(strFile,".txt",4);}

void Init(struct student*);void Print(struct student*);int main(void){	struct student {		char fio[30];		int group;		float average;	};	struct student s, *st;	int i;	st = &s;	Init(st);	Print(st);	return 0;}void Init(struct student *st){	printf("\nEnter name: ");	scanf("%s", st->fio);	printf("\nEnter group: ");	scanf("%d", &st->group);	printf("\nEnter average mark: ");	scanf("%f", &st->average);}void Print(struct student *st){	printf("\nName: %s", st->fio);	printf("\nGrouproup: %d", st->group);	printf("\nAverage mark: %.2f", st->average);}

struct addr {  char name[30];  char street[40];  char city[20];  char state[3];  unsigned long int zip;} addr_info, binfo;

int sum(int a, int b){	return a+b;}int main(void){	int n=4, m=3, s;	s = sum(n,m);	printf("%d + %d = %d\n", n, m, s);		return 0;}

char *names[] = {"Иван", "Пётр", "Илья"};char *surnames[] = {"Иванов", "Пётров", "Ильин"};

extern int x, y;extern char ch;static void func1(void){	y = 100;}int func2(int a){	int b;	b = a;	return b;}extern void func2(void){	x = y/10;	ch = 'R';}

	int x = 0;loop1:	x++;	if (x<=5) {		printf("%d \n", x);		goto loop1;	}

			int x = 5, y;	for(y=1; y<=x; ++y)  		printf("%d ", y);		y = x*2;	

	int x = 15, y = 2;	float z;	z = x/y;	printf("z = %f\n", z);

	char ch = 'a';	int a;	float b;	double c = 4.5;	double d;	printf("Enter a:");	scanf("%d", &a);	printf("Enter b:");	scanf("%lf", &b);	d = (double)ch + a + b + c;

			printf("\n  Maximum integer: %d\n ", INT_MAX);

	int a = INT_MIN;	int b = INT_MAX;

			int x;	printf("Угадайте число:\n");	for (x=0; x!=123; ) 		scanf("%d", &x);

	int c = 0, n = 100, m;	do {		printf("Ваш вариант: ");		scanf("%d", &m);		c++;	} while <Условие>

	int num; 	do {		scanf("%d", &num);	} while (num > 100);	

	int cond,;	cond = (A==5) || ((A>10) && (A<1));

	int x = 10, y;	if(x>9) y = 100;	else y = 200;

	int x;	printf("Введите число от 1 до 7: ");	scanf_s("%d", &x);	switch (x<=5 ? 1 :			x==6 ? 2 : 3)	{	case 1:		printf("Сегодня рабочий день"); 		break;	case 2:		printf("Сегодня суббота"); 		break;	case 3:		printf("Сегодня воскресенье"); 		break;	default:		printf("Ошибка! Вы ввели неверное число");		break;	}

  int a, b, res = 0;  char op;  int f = 1;  printf("Введите 1й операнд: ");  scanf("%d", &a);  printf("Введите знак операции: ");  scanf("%s", &op);  printf("Введите 2й операнд: ");  scanf("%d", &b);  switch (op) {	  case '+': res = a+b; break;	  case '-': res = a-b; break;	  case '*': res = a*b; break;	  case '/': res = a/b; break;	  default: 		  printf("Неизвестная операция\n");		  f = 0;  }  f = f*2;  if (f) printf ("Результат: %d", res);

  int n = 1;  while (n<=10)  {	  if (n%2) 		  printf("%d\n", n);		  n++;		  return;	  printf("%d\n", n);	  n++;  }

  int isqrd = 0, i;  printf("Введите число: ");  scanf("%d", &i);  isqrd = (!(i%2) && i>0) ? i*i : -(i*i);  printf("%d в квадрате %d", i, isqrd);

#include <stdio.h>#define N 10#define M 5int main(){		int i;	int arr1[N] = {3, 4, 5, 4};	int arr2[M] = {1, 6, 3, 7, 9};		i = sizeof(arr1)/sizeof(arr1[0]) + sizeof(arr2)/sizeof(arr2[0]);	printf("i = %d\n", i);	return 0;		}

#include <stdio.h>#define N 5int main(){		int m, i;	int arr[N] = {3, 2, 4, 5, 1};		m = 1;	for (i=1; i<N; i++)		if (arr[i]<arr[m]) m = i;	printf("a[m] = %d", arr[m]);	return 0;		}

#include <stdio.h>#define N 5#define M 2int main(){			int i, j, sum=0;	int arr[N][2] = {0,1,2,3,4,5,6,7,8,9};	for (i=0; i<N; i++)	{		for (j=0; j<M; j++)			if (!(arr[i][j]%2)) sum+=arr[i][j];	}		printf("sum = %d\n", sum);	return 0;}

	int size1, size2, size3;	int arr[5][2] = {0,1,2,3,4,5,6,7,8,9};	size1 = sizeof(arr)/sizeof(arr[0][0]);	size2 = sizeof(arr)/sizeof(arr[0]);	size3 = sizeof(arr);	

	int size1, size2, size3;	int arr[5][2] = {0,1,2,3,4,5,6,7,8,9};	size1 = sizeof(arr)/sizeof(arr[0][0]);	size2 = sizeof(arr)/sizeof(arr[0]);	size3 = sizeof(arr);	

	int n = 0;	char str2[10] = "Lection\0";	n = strlen(str2);

	char str1[10] = "Lection";	char str2[10] = "Lection\0";

#include <stdio.h>#include <string.h>#define N 10int main(){		int i = 0;	char ch;	char str1[N] = "test";	char str2[N];	ch= str1[0];	while (ch!='\0')	{		str2[i] = str1[i];		i++;		ch= str1[i];	}		return 0;}

	char s[5], psw[] = "password";	int i, k= 0;	for (i=0; !k && i<3; i++) {		printf("Введите пароль: \n"),		gets(s);		if (!(strcmp(s, psw))) k = 1;	}		if (k) printf("Добро пожаловать! TRUE");	else printf("Ошибка: Неверный пароль! FALSE");

	int i = 0;	char str1[10] = "Test";	char str2[10] = "";	while (str1[i]!='\0') {		str2[i] = str1[i];		i++;	}

#include <stdio.h>#define N 7int main(){		int i, j, k, buf;	char arr[N] = "Lection";	for (i=0; i<N; i++)		for (j=0; j<N-1; j++)		{			if (arr[j] < arr[j+1])			{				buf = arr[j];				arr[j] = arr[j+1];				arr[j+1] = buf;			}		};	for (k=0; k<N; k++)		printf("%c ", arr[k]);	return 0;		}

#include <stdio.h>#include <conio.h>int main(){		int n=0, i=0;	char ch, str[30]="";	printf("Введите строку: ");	scanf("%s", str);	printf("Введите символ: ");	ch = _getche();	while(str[i]!='\0')	{		if(str[i]==ch) n++;		i++;	}	return 0;		}

	int a=10, b=20, c=30;	int *ptr;	ptr = &a;	c = *ptr;	*ptr = 30;	b = a;

#include <stdio.h>#include <conio.h>int main(){		int n=0, i=0, j=0;	char ch, str[30]="";	char *ptr1, *ptr2;	printf("Введите строку: ");	scanf("%s", str);	printf("Введите символ: ");	ch = _getche();	ptr1 = str;	while(*ptr1!='\0')	{		ptr2 = str;		while (*ptr2!='\0') {			if(*ptr1==*ptr2) n++;			++ptr2;		}		printf("\n%c - %d", *ptr1, n);		n = 0;		++ptr1;	}	printf("\n");	return 0;		}

	int x = 20;	x++;

	int n = 123, t;	void *p;	int *pn;	pn = &n;

		#include <stdio.h>#include <conio.h>int main(){		char str1[10] = "", str2[10] = "";	char *ptr1, *ptr2;	printf("Введите строку: %s", str1);	scanf("%s", str1);	ptr1 = str1;	ptr2 = str2;	while (*ptr1!='\0') {		if (*ptr1=='\0') {			*ptr2 = '\0';			break;		}		*ptr2 = *ptr1;		ptr1++;		ptr2++;	}	printf("str2 = %s\n", str2);	return 0;		}

  int x = 10, y = 20, z;  int *p1, *p2;  p1 = &x;  p2 = p1;  <Выражение>  z = (x==y) ? (x+y) : (y-x);	

	int  x = 88, *ptr1,  **ptr2;	ptr1 = &x;	ptr2 = &ptr1;	

	int i, N, sum = 0;	int arr[] = {3, 2, 4, 5, 1};	int *ptr;	N = sizeof(arr)/sizeof(arr[0]);	ptr = &arr[1];	for (i=0; i<N-1; i++) {		sum += *ptr;		ptr++;	}

	int m[][5] = {{1,2,3,4,5}, {6,7,8,9,10}, {11,12,13,14,15}};	int *ptr;	int i, j, n, k, sum = 0;	n = sizeof(m)/sizeof(m[0]);	k = sizeof(m[0])/sizeof(m[0][0]);	ptr = m;}                    sum += *(ptr+i); }	printf("n = %d\n", n);	printf("k = %d\n", k);	for (i=0; i<(n*k); i++) {		if (!(*(ptr+i)%2)) sum += *(ptr+i);

	int m[][5] = {{1,2,3,4,5}, {6,7,8,9,10}, {11,12,13,14,15}};	int *ptr;	int i, j, n, k, el;	n = sizeof(m)/sizeof(m[0]);	k = sizeof(m[0])/sizeof(m[0][0]);	ptr = &m[1][1];

			int arr1[10] = {1,2,3,4,5};				(1)	int *arr2 = (int *)calloc(10, sizeof(int));		(2)	int *arr3 = (int *)malloc(10*sizeof(int));		(3)	int arr4[][3] = {{1,2,3}, {4,5,6}};			(4)

		#include <stdio.h>#include <stdlib.h>#define N 10int main(void){	int size1, size2, size3, i, n = 0;	int arr1[N] = {1,2,3,4,5}, *arr;		size1 = sizeof(arr1);	arr = (int *)calloc(N, sizeof(int));	if (!arr) {		printf("\nERROR! Out of memory in calloc() function. Press any key: ");		_getch(); 		exit(1); 	};	for (i=0; i<N; i++) {		arr[i] = i+1;		n++;		printf("arr[%d] = %d\n", i, arr[i]);			}	size2 = N*sizeof(int);	arr = (int *)realloc(arr, (N+2)*sizeof(int));	if (!arr) {		printf("\nERROR! Out of memory in realloc() function. Press any key: ");		_getch(); 		exit(1); 	};	for (i=N; i<N+2; i++) {		arr[i] = i+1;		printf("arr[%d] = %d\n", i, arr[i]);	}	for (i=0, n=0; i<N+2; i++) n++;	size3 = n*sizeof(int);	free(arr);	return 0;}

		#include <stdio.h>#include <stdlib.h>#define N 10int main(void){	int i;	int *arr;	for (i=0; i<N; i++) {		arr[i] = i+1;		printf("arr[%d] = %d\n", i, arr[i]);			}	arr = (int *)realloc(arr, (N+2)*sizeof(int));	if (!arr) {		printf("\nERROR! Out of memory in realloc() function. Press any key: ");		_getch(); 		exit(1); 	};	for (i=N; i<N+2; i++) {		arr[i] = i+1;		printf("arr[%d] = %d\n", i, arr[i]);	}	free(arr);	return 0;}

			int i;	int **m;	m = (int **)calloc(5,sizeof(int *));	for (i=0; i<5; i++)		m[i] = (int *)calloc(3,sizeof(int));

int sq(int a, int x){	int i, res = 1;	for (i=0; i<x; i++)		res*= a;	return res;}int main(void){	int n=4, b = 3, p;	p = sq(n,b);	printf("%d^%d = %d\n", n, b, p);		return 0;}

double max(double a, b){	if (a>b) 		return a;	return b;}int main(void){	double x=-5.00, y=5.12;	printf("max = %.2f\n", max(x,y));		return 0;}

	int is_in(char *s,  char c)				(1)	{	  while(*s)						(2)		if(*s==c) return 1;				(3)			else s++;					(4)	  return 0;						(5)	}

#include <stdio.h>#include <stdarg.h>int average(int first, ... );int main( void ){	int x = average(2, 3, 4, -1);	return 0;}int average( int first, ... ){   int count = 0, sum = 0, i = first;   va_list marker;   va_start(marker, first);   while( i != -1 ) {      sum += i;      count++;      i = va_arg(marker, int);   }   va_end(marker);   return( sum ? (sum / count) : 0 );}

#include <stdio.h>#include <conio.h>#include <stdarg.h>void error(int severity, ... );int main( void ){	char err[][30] = {"Сообщение 1", "Сообщение 2"};	int n = -1;		printf("Введите степень критичности ошибки (целое число): ");	scanf("%d", &n);	switch (n) {		case 0: error(0, "Ошибка!", '\0');			break;		case 1: error(0, "Ошибка!", err[0], '\0');			break;		default: error(1, "Ошибка!", err[0], err[1], '\0');	}	return 0;}void error(int severity, ... ){   va_list ap;   va_start(ap, severity);   for (;;) {	   char *p = va_arg(ap, char*);	   if (p == '\0') break;	   printf("%s ", p);   }   va_end(ap);   printf("\n");}

#include <stdio.h>#define n 10void fun(int *mas, int k);int main( void ){	int arr[n] = {3,4,5,4,4};	int i;	fun(arr, n);	return 0;}void fun(int *mas, int k){   int i, s = 0;   for (i=0; i<k; i++) ++mas[i];}

#include <stdio.h>#include <stdlib.h>#define n 2#define m 3int sum(int *a, int x, int y);int main( void ){	int i, s;	int a[n][m] = {{1,2,3}, {4,5,6}};		s = sum(*a, n, m);	printf("Сумма элементов а: %d\n", s);		return 0;}int sum(int *a, int x, int y){   int i, j, s = 0;   for (i=0; i<x; i++) 	   for (j=0; j<y; j++) s += a[i*y+j];   return s;}

#include <stdio.h>#define n 5void fun(int *mas, int k);int sum(int *mas, int k);int main( void ){	int arr[n] = {3,4,1,2};	int i, s;	fun(arr, n);	s = sum(arr, n);	return 0;}void fun(int *mas, int k){   int i, s = 0;   for (i=0; i<k; i++) ++mas[i];}int sum(int *mas, int k){   int i, s = 0;   for (i=0; i<k; i++) s += mas[i];   return s;}

int *sum(int A[], int B[], int n){    int i;	int *ptr = (int *)calloc(n, sizeof(int));     for (i = 0; i < n; i++) ptr[i] = A[i] + B[i];    return ptr;}

void PuzSortInc (int*, int );void PuzSortDec (int*, int);int main (void) {	int A[] = {56, 34, 2, 0, 1, -21, 6, 8, 7};	int i, n, alg;	<Объявление указателя pFun на функции>	n = sizeof(A)/sizeof(A[0]);	printf("Исходный массив: ");	for (i = 0; i < n; i++) printf(" %3d", A[i]);	printf("\nВыберите алгоритм сортировки (1 - \"методом пузырька\" по возрастанию,\		   2 - \"методом пузырька\" по убыванию: ");	scanf("%d", &alg);	switch (alg) {		case 1: pFun = PuzSortInc; break;		case 2: pFun = PuzSortDec; break;		default: printf("ERROR! Такого алгоритма не определено!");	}	if (pFun) {		pFun(A,n);		printf("\nSorted array: ");		for (i = 0; i < n; i++) printf(" %3d", A[i]);	};			return 0;}void PuzSortInc (int* arr, int size){	int i, j, buf; 	for (i = 0; i < size - 1; i++ ) {		for (j = 0; j < size - 1; j++) {			if (arr[j] > arr[j + 1]) {				buf = arr[j];				arr[j] = arr[j+1];				arr[j+1] = buf;			}						}	}}void PuzSortDec (int* arr, int size){	int i, j, buf; 	for (i = 0; i < size - 1; i++ ) {		for (j = 0; j < size - 1; j++) {			if (arr[j] < arr[j + 1]) {				buf = arr[j];				arr[j] = arr[j+1];				arr[j+1] = buf;			}						}	}}

int main (void) {	double (*pFunc) (double);	int c = 1;	double y;	while(1) {		printf("Выберите функцию (0-выход): 1-sqrt, 2-sin, 3-tan\n");		scanf("%d", &c);		switch(c) {			case 1: pFunc = sin; break;			case 2: pFunc = sqrt; break;			case 3: pFunc = tan; break;			case 0: return;			default: continue;		}			y = pFunc(1.1);		printf("f(1.1) = %.2f\n", y);	}			return 0;}

char *xgets(char *s){  char ch, *p;  int t;  p = s;   for(t=0; t<80; ++t){    ch = getchar();    switch(ch) {      case '\n':        s[t] = '\0';         return p;      case '\b':        if(t>0) t--;        break;      default:        s[t] = ch;    }  }  s[79] = '\0';  return p;}

	char str[30], i;	FILE *fp;	if((fp = fopen("g:\\test.txt", "r"))==NULL) {		printf("Ошибка при открытии файла.\n");		exit(1);	}	fgets(str, 30, fp);	i = strlen(str);	fclose(fp);

#include <stdio.h>int main( void ){   FILE *stream;   char list[30];   int  i, numread, numwritten;   if( (stream = fopen("g:\\fread.out", "w+t")) != NULL )   {      for ( i = 0; i < 26; i++ )         list[i] = (char)('z' - i);       numwritten = fwrite( list, sizeof( char ), 26, stream );      printf( "Wrote %d items\n", numwritten );      fclose( stream );   }   else      printf( "Problem opening the file\n" );   if( (stream = fopen("g:\\fread.out", "r+t" )) != NULL )   {       numread = fread( list, sizeof( char ), 26, stream );      printf( "Number of items read = %d\n", numread );      printf( "Contents of buffer = %.26s\n", list );      fclose( stream );   }   else      printf( "File could not be opened\n" );}

int main( void ){   FILE *stream;   char line[81];   int  result;   if ( fopen_s( &stream, "g:\\fseek.out", "w+" ) != 0 )   {      printf( "The file fseek.out was not opened\n" );      return -1;   }   fprintf( stream, "Ivanov - 09.06.1980 \n"                    "Petrov - 10.03.1986 \n"					"Sidorov - 08.11.1985\n");   result = fseek( stream, 0L, SEEK_SET);   if( result )      perror( "Fseek failed" );   else   {      fgets( line, 80, stream );      printf( "%s", line );    }   fclose( stream );   return 0;}

int main(void){  FILE *fp;  char str[30] = "Lection 11";  int k, l, m;  if((fp=fopen("g:\\test.txt", "wt+"))==NULL) {    printf("Ошибка при открытии файла.\n");    exit(1);  }  k = fwrite(str, sizeof(char), strlen(str)-3, fp);  rewind(fp);  l = fread(str, sizeof(char), sizeof(str)/sizeof(char), fp);   m= l - k;  fclose(fp);  return 0;}

int main( void ){   FILE *stream;   char str[81];   int  result;   if ( fopen_s( &stream, "g:\\list.txt", "r+" ) != 0 )   {      printf( "The file list.txt was not opened\n" );      return -1;   }    result = fseek( stream, -27L, SEEK_END);   if( result )      perror( "Fseek failed" );   else   {      fputs( "5. NEC MultiSync EX231W - 10490 rub.", stream );      printf( "%s", str );    }   fclose( stream );   return 0;}

struct A {int a; double x; };struct B {A a; B b; double x; }; 

struct Account{  int account;  char name[30];  int balance;};

void PrintStruct(char*, int, int);int main (void){	<Объявление структуры Account и переменных acc1, acc2>	acc2 = &acc1;		acc1.account = 346578;	strcpy(acc1.name, "Ivanov");	acc1.balance = 30000;	PrintStruct(acc1.name, acc1.account, acc1.balance); 	acc2->account = 90005;	strcpy(acc2->name, "Pertov");	acc2->balance = 46000;	PrintStruct(acc2->name, acc2->account, acc2->balance); 	return 0; }void PrintStruct(char *str, int a, int b){	printf("Name: %s\n", str);	printf("Account: %d\n", a);	printf("Balance: %d\n\n", b);}

int main (void){	struct student { 		char *name;		char *birthday;		int group;	} s1, s2;	int s;		s1.name = "Ivanov";	s1.birthday = "10.03.1985";	s1.group = 1014;	s2.name = "Petrov";	s2.birthday = "08.04.1985";	s2.group = 1309;	s2.group = s1.group;	if (s2.group == s1.group)		printf("Students %s and %s are studying in the same group\n", s1.name, s2.name);	else		printf("Students %s and %s are not studying in the same group\n", s1.name, s2.name);	return 0; }

int main (void){	typedef struct {    		char nazn[40];  		int numb; 		char time[10];	} train;	train tr[3];		int i = 0, sum = 0, ch=0;	char str[10], search[10];	while(ch!=121) {		printf("\nEnter information about train (Q - quit): \n");		printf("Enter destination of the train: ");		gets(tr[i].nazn);		printf("Enter number of the train: ");		gets(str);		tr[i].numb = atoi(str);		printf("Enter time of scheduled departure: ");		gets(tr[i].time);		++i;		printf("Quit? (y/n): ");		ch = _getche();	};		printf("\n\nEnter train destination: ");	gets(search);	for (i=0; i<3; i++) {		if (strcmp(tr[i].nazn,search)==0) {			printf("\n\tTrain number: %d", tr[i].numb);			printf("\n\tTime: %s", tr[i].time);		}	}	if (i>=3)		printf("There is no train to this destination");    return 0; }

union hold {	int digit;	double bigf;	char letter;};

enum numbers {two=2, tree, four, ten=10, eleven, last=ten+40};

union hold {	int digit;	double bigf;	char letter;};

union test {  char ch1[5];  char ch2[2];  char ch3[1];};int main(void){	union test t;	char *str;	strcpy(t.ch1, "test");	strcpy(t.ch2, "be");	t.ch3[0] = 'w';	str = t.ch1;	return 0;}

typedef union pw_union {  short int i;  char ch[2];} pw;int putw(short int num, FILE *fp);int main(void){  FILE *fp;  fp = fopen("g:\\test.tmp", "wb+");  if(fp == NULL) {    printf("Файл не открыт.\n");    exit(1);  }  putw(1025, fp);  fclose(fp);  return 0;}int putw(short int num, FILE *fp){  union pw word;  word.i = num;  putc(word.ch[0], fp);   return putc(word.ch[1], fp); }

int main(void){	union pw {	  int i;	  double d;	  char ch[2];	} pw = {121};		printf("pw.ch = %s", pw.ch);		return 0;}

int main(void){	enum coin { penny, nickel, dime, quarter, half_dollar, dollar};	enum coin money;	char name[][12]={	  "penny",	  "nickel",	  "dime",	  "quarter",	  "half_dollar",	  "dollar"	};	money = half_dollar;	printf("%s", name[money]);		return 0;}

int main(void){	typedef enum { ERR_READ, ERR_WRITE, ERR_CONVERT} Err;	Err error;	switch (error) {		case ERR_READ:			printf("Возникла ошибка чтения (ERR_READ)\n");			break;		case ERR_WRITE:			printf("Возникла ошибка записи (ERR_WRITE)\n");			break;		case ERR_CONVERT:			printf("Возникла ошибка преобразования (ERR_CONVERT)\n");			break;		default:			printf("Возникла неизвестная ошибка\n");			break;	};		return 0;}

int main (void) {	enum month {january, february, march, april, may, 				june,july, august, september, october, november, 				december } aMonth;	int days;	printf("\n Enter the number of the month (1 - 12): ");	scanf_s("%d", &aMonth);	switch (aMonth) {		case january:		case march:		case may:		case july:		case august:		case october:		case december:			days = 31;			break;			case april:		case june:		case september:		case november:			days = 30;			break;		case february:			days = 28;			break;		default:			printf("\n\t Wrong number of the month\n");			days = 0;			break; 	}	if (days)	printf("\n The number of days of the month: %d\n", days);	if (aMonth == 2)	printf("\n ... or 29 if it is a leap year\n");	return 0; }

struct fred {	char x;	int y;	float z;	char str[10]; } mike;

#define MAX 20double sum(double, double);int main (void) {	struct test {		char A[MAX+1]; 		double ax; 		char B[MAX+1]; 		double by;	};	struct test AB;		printf("\nEnter 1st name: ");	gets_s(AB.A, MAX);	printf("\nEnter the first real number: ");	scanf_s("%lf", &AB.ax);	_flushall();	printf("\nEnter 2nd name: ");	gets_s(AB.B, MAX);	printf("\nEnter the second real number: ");	scanf_s("%lf", &AB.by);	printf("\n\nThe sum of two numbers %1.2f and %1.2f, %s and %s: %1.2f\n",			AB.ax, AB.by, AB.A, AB.B, sum(AB.ax, AB.by)); 	return 0; }double sum(double x, double y) {	return (x + y);}

typedef struct {	int a, b;	char ch;} struct_type;int main(void){	struct_type arg;	arg.a = 1000;	f1(&arg);	return 0;}

typedef struct {	char fio[30];	int group;	float average;} student;void Init(student*);int main(void){	student s, *st;	int i;	st = &s;	Init(st);	<Вывод данных на экран>		return 0;}void Init(student *st){	printf("\nEnter name: ");	scanf("%s", st->fio);	printf("\nEnter group: ");	scanf("%d", &st->group);	printf("\nEnter average mark: ");	scanf("%f", &st->average);}

void Init(struct student*);void Print(struct student*);int main(void){	struct student {		char fio[30];		int group;		float average;	};	struct student s, *st;	int i;	st = &s;	Init(&st);	Print(st);	return 0;}void Init(struct student *st){	printf("\nEnter name: ");	scanf("%s", st.fio);	printf("\nEnter group: ");	scanf("%d", &st.group);	printf("\nEnter average mark: ");	scanf("%f", &st.average);}void Print(struct student *st){	printf("\nName: %s", st->fio);	printf("\nGrouproup: %d", st->group);	printf("\nAverage mark: %.2f", st->average);}

struct student {	char fio[30];	int group;	float average;};struct student Init(char*, int, float);void Print(struct student*);int main(void){	struct student s, *st;	int i;	st = Init("Ivanov I.", 3801, 5.00);	Print(st);	return 0;}struct student Init(char* n, int i, float f){	struct student s, *st;	st = &s;	strcpy(st->fio, n);	st->group = i;	st->average = f;	return s;}void Print(struct student *st){	printf("\nName: %s", st->fio);	printf("\nGrouproup: %d", st->group);	printf("\nAverage mark: %.2f\n", st->average);}

typedef struct {	char fio[30];	char phone[20];	int age;} note;note Init(char*, char*, int);void Print(note*);void Modify(note);int main(void){	note n[3], *pn;	char *strName[3] = {"Ivanov I.", "Pertov P.", "Sidorov S."};	char *strPhone[3] = {"12-34-56", "78-90-12", "34-56-78"};	int i, age = 25;	for (i=0; i<3; i++) {		n[i] = Init(strName[i], strPhone[i], age+i);		pn = &n[i];		Print(pn);	}	Modify(n[0]);	pn = &n[0];	Print(pn);	return 0;}note Init(char* f, char* p, int a){	note n, *pn;	pn = &n;	strcpy(pn->fio, f);	strcpy(pn->phone, p);	pn->age = a;	return n;}void Print(note *pn){	printf("\nName: %s", pn->fio);	printf("\nPhone: %s", pn->phone);	printf("\nAge: %d\n", pn->age);}void Modify(note n) {	strcpy(n.fio, "Vasiliev V.");	strcpy(n.phone, "89-01-23");	n.age = 30;}

typedef struct sale_struct {	char *title;	int price;} sale;sale Copy(sale);int main(void){	sale s1,s2;	struct sale_struct s3, s4;	s1.title = "Book";	s1.price = 200;	s3.title = "Cake";	s3.price = 60;	return 0;}sale Copy(sale s) {	sale s1;	s1 = s;	return s1;}

typedef struct sale_struct {	char *title;	int price;} sale;

int main(void){	struct Options {		unsigned int  centerX : 1;		unsigned int centerY : 1;		unsigned int shadow : 2;		unsigned int palette : 4;	};		int b;	struct Options t, *pt;	t.shadow = 12;	t.palette = 10;	b = t.shadow + t.palette;	printf("b = %d\n", b);	return 0;}	

int main(void){	struct test {		unsigned int a : 2;		unsigned int b : 8;	};		int c;	struct test t;	t.b = 255;	t.a = 3;	c = t.b | t.a;	printf("c = %d\n", c);	return 0;}	

	a = 6 & 5;	b = 6 | 5;	c = 6 ^ 5;

		int d;	int a = 10;	int b = 15;		a >>= 1;	b <<= 1;	d = a + b;

int func1(int a);static void func2(void);extern void func3(void);

int c = 9;int sum(int a, int b){	return a+b;}int t = 8;int main(void){	int n=4, m=3, s1, s2;	s1 = sum(n,m);	s2 = mul(n,m);	return 0;}int mul(int a, int b){	return a*b;}

int test();int a = 1;int main (void) {	int b, s;	extern int x;	static int c;	s = test();	return 0;  }int test() {	int t = a;	return t;}int x = 4;

int min(int, int);int t;int main(void){	register int x=-5, y=5, m;	int *p;	p = &x;	m = min(x,y);	printf("min = %d\n", m);		return 0;}int min(register int a, register int b){	int m = (a<b) ? a : b;	return m;}

int f();static int d = 5, e = 8;int main(void){	int n = 1, m = 1;	int s;	s = f();		return 0;}int f(){	int p;	static int c = 0;	p = c;	printf("d = %d",d);	return p;}

extern int x, y;extern char ch;void func22(void){	y = 100;}void func23(void){	x = y/10;	ch = 'R';}

long fact(long n) {	return (n>1) ? n * fact(n-1) : 1;}

void fillOnly(int);void free_n(int);void fill_n(int);int main (void) {	int n = 1; 	int in = 1; 	printf("\n Enter a length of string (naturel number): ");	in = scanf_s("%i", &n);	if (in != 1 || n < 1 || n > 15)     {		printf("\n Error input. Press any key to exit: ");		_getch();		exit(0);	}	puts("\n\tResult:");	fill_n(n);	printf("\n\n Press any key to exit: ");	_getch();	return 0;}void fillOnly(int n) {	if (n == 1)		printf("\t%+3d\n", 1);	else {		fillOnly(n-1);		printf("\t%+3d\n", n);		free_n(n-1);	}}void free_n(int n) {	if (n == 1)		printf("\t%+3d\n", -1);	else {		fillOnly(n-1);		printf("\t%+3d\n", -n);		free_n(n-1);	}}void fill_n(int n) {	if (n == 1)		printf("\t%+3d\n", 1);	else {		if (n == 2)			printf("\t%+3d\n\t%+3d\n", 1, 2);		else {			fillOnly(n-1);			printf("\t%+3d\n", n);			fill_n(n-2);		}	}}

#define N 8void step(int, int, int);	int map[N][N];	// карта: map[i,j]!=0, если точки i и j соединены	int road[N];	// маршрут - номера точек карты	int incl[N];	// incl[i]==1, если точка с номером i включена в road	int start;	// начальная точка маршрута 	int finish;	// конечная точка маршрута	int i, j;int main (void) {	// инициализация массивов	for (i=0; i<N; i++) road[i] = 0;	for (i=0; i<N; i++) incl[i] = 0;	for (i=0; i<N; i++) 		for (j=0; j<N; j++) map[i][j] = 0;	// ввод значений элементов карты	map[1][2] = 1; map[2][1] = 1; 	map[1][3] = 1; map[3][1] = 1;	map[1][4] = 1; map[4][1] = 1;	map[3][4] = 1; map[4][3] = 1;	map[3][7] = 1; map[7][3] = 1;	map[4][6] = 1; map[6][4] = 1;	map[5][6] = 1; map[6][5] = 1;	map[5][7] = 1; map[7][5] = 1;	map[6][7] = 1; map[7][6] = 1;	printf("Введите через пробел номер начальной и конечной точек: ");	scanf("%d %d", &start, &finish);	road[1] = start;	// внести точку в маршрут	incl[1] = 1;		// пометить точку как включенную	step(start, finish, 2);	return 0;}void step(int s, int f, int p) {	int c;				// номер точки, в которую делается очередной шаг	int i;		if (s==f) {		printf("Путь: ");		for (i=1; i<=p-1; i++) printf("%d ", road[i]);		printf("\n");	}	else {		// выбор очередной точки		for (c=1; c<=N; c++)			// проверка всех вершин			if (map[s][c]!=0 && incl[c]==0) {				// точка соединена с текущей и не включена в маршрут				road[p] = c;		// добавление вершины в путь				incl[c] = 1;		// пометка вершины как включенной				step(c, f, p+1);				incl[c] = 0;				road[p] = 0;			}	}}

int summa(int N, int a[6]);int main(){	int i,n;	int a[6] = {8, 65, 10, 2, 4, 1};	n = sizeof(a)/sizeof(a[0]);	printf("Сумма: %d", summa(n-1, a));}int summa(int N, int a[6]){	return a[N]+summa(N-1, a);}

int Sum(int x, int step, int n){         if (n==1) return(x);        else return(Sum(x, step, n-1)+step);}int main(){         int x, s, n;		int pr;		printf("Введите первый член, число элементов и разность прогрессии:");		scanf("%d %d %d", &x, &n, &s);        <Вызов функции sum()>		printf("pr = %d", pr);		return 0;} 

#include <stdio.h> #define	SQR(x)	(x*x)int main(){ 	int x, y=2;	x = SQR(y+1);	printf("x = %d", x);	return 0;} 

char *names[] = {"Иван", "Пётр", "Илья"};char *surnames[] = {"Иванов", "Пётров", "Ильин"};

extern int x, y;extern char ch;void func22(void){	y = 100;}void func23(void){	x = y/10;	ch = 'R';}

#if VERSION == 1	#define	INCFILE	"vers1.h"#elseif VERSION == 2	#define	INCFILE	"vers1.h"#else	#define	INCFILE	"versN.h"#endif#include INCFILE

#ifndef HEADER_INCLUDED#include "arr.h"#define HEADER_INCLUDED#enif

int main(int argc, char* argv[]){	char name[30];	FILE *f;	f = fopen("g:\\test.txt", "w+");	fprintf(f, "%s\n%s", argv[0], argv[1]);		return 0;}

#include <stdio.h>#include <conio.h>#include <stdarg.h>#include <stdlib.h>#include <locale.h>void error(int severity, ... );int main(int argc, char* argv[]){	char err[][30] = {"Сообщение1", "Сообщение2"};	int n;		setlocale (LC_ALL, "rus");	n = argv[1];	switch (n) {		case 0: error(0, "Ошибка!", '\0');			break;		case 1: error(0, "Ошибка!", err[0], '\0');			break;		default: error(1, "Ошибка!", err[0], err[1], '\0');	}	return 0;}void error(int severity, ... ){   va_list ap;   va_start(ap, severity);   for (;;) {	   char *p = va_arg(ap, char*);	   if (p == '\0') break;	   printf("%s ", p);   }   va_end(ap);   printf("\n");}

int main(int argc, char* argv[]){	int n1, n2, n3, m, sum;	m = argc;	n1 = atoi(argv[1]);	n2 = atoi(argv[2]);	n3 = atoi(argv[3]);	sum = n1 + n2 + n3 + m;	printf("sum = %d\n", sum);	return 0;}

int main(int argc, char *argv[]){	int disp, count;	setlocale (LC_ALL, "rus");	if(argc<2) {		printf("В командной строке на задано число\n");		exit(1);	}	if(argc==3 && !strcmp(argv[2], "display")) disp = 1;	else disp = 0;	for(count=atoi(argv[1]); count; --count)		if(disp) printf("%d ", count);	putchar('\a');	printf("Счет закончен");	return 0;}

int main(int argc, char *argv[]){	int t;	for(t=0; t<argc; ++t)		printf("%s\n", argv[t]);	return 0;}

		#include <stdio.h>#include <stdlib.h>#define N 10int main(void){	int i;	int *arr = (int *)malloc(N*sizeof(int));		if (!arr) {		printf("\nERROR! Out of memory in calloc() function. Press any key: ");		_getch(); 		exit(1); 	};	for (i=0; i<N; i++) {		arr[i] = i+1;		printf("arr[%d] = %d\n", i, arr[i]);			}	arr = (int *)realloc(arr, (N+2)*sizeof(int));	if (!arr) {		printf("\nERROR! Out of memory in realloc() function. Press any key: ");		_getch(); 		exit(1); 	};	for (i=N; i<N+2; i++) {		arr[i] = i+1;		printf("arr[%d] = %d\n", i, arr[i]);	}	free(arr);	return 0;}

	int i = 0, k = 0;	char str1[10] = "Test";	char str2[10] = "Test1";	if (strlen(str1)>(strlen(str2))) k = 1;	if (strlen(str1)<(strlen(str2))) k = -1;	if (strlen(str1)==(strlen(str2)))		while (str1[i]!='\0') {			if (str2[i]!=str1[i]) {				k = -1;				break;			}			i++;		}

char s[100];int pal(char s[100]);int main(){ 	printf("\nВведите строку: "); 	gets(s);	if (pal(s)) printf("Строка является палиндромом");	else  printf("Строка не является палиндромом");	return 0;}int pal(char s[100]){ 	int l; char s1[100];		if (strlen(s)<1) return 1;	else {		l=s[0]==s[strlen(s)-1];		strncpy(s1, s+1, strlen(s)-2);		s1[strlen(s)-2]='\0';		return l&&pal(s1);	}}

#include <stdio.h> #define	DIV(x, y)	(x/y)int main(){ 	float x=2.0, y=2.0;	float z;	z = DIV(x+1, y+1);	printf("x = %.1f", x);	return 0;} 

#include <stdio.h>#define n 10void fun(int *mas, int k);int main( void ){	int arr[n] = {3,4,5,4,4};	int i;	fun(arr, n);	return 0;}void fun(int *mas, int k){   int i, s = 0;   for (i=0; i<k; i++) ++mas[i];}

int main(void){	enum coin { penny, nickel, dime, quarter=100, half_dollar, dollar};	enum coin money;	printf("%d ", penny);	printf("%d ", nickel);	printf("%d ", dime);	printf("%d ", quarter);	printf("%d ", half_dollar);	printf("%d ", dollar);		return 0;}

			int x=123;	printf("Угадайте число:\n");	for (x=0; x==123; ) 		scanf("%d", &x);

	int a = SCHAR_MIN;	int b = SCHAR_MAX;

long fact(long n) {	return (n>1) ? n * fact(n-1) : 1;}

extern int x, y;extern char ch;void func22(void){	y = 100;}void func23(void){	x = y/10;	ch = 'R';}

int main (void) {	enum month {january = 1, february, march, april, may, 				june,july, august, september, october, november, 				december } aMonth;	int days;	printf("\n Enter the number of the month (1 - 12): ");	scanf_s("%d", &aMonth);	switch (aMonth) {		case january:		case march:		case may:		case july:		case august:		case october:		case december:			days = 31;			break;			case april:		case june:		case september:		case november:			days = 30;			break;		case february:			days = 28;			break;		default:			printf("\n\t Wrong number of the month\n");			days = 0;			break; 	}	if (days)	printf("\n The number of days of the month: %d\n", days);	if (aMonth == 2)	printf("\n ... or 29 if it is a leap year\n");	return 0; }

void swap(int *pa, int *pb){	int temp;	temp = *pa;	*pa = *pb;	*pb = temp;}

int main( void ){	int i, j, k, buf;	FILE *stream;	char str[11] = "Lection 11";	if( (stream = fopen("g:\\fread.txt", "w+t")) == NULL )		printf( "Problem opening the file\n" );	else {		k = fwrite(str,sizeof(char), sizeof(str)/sizeof(char), stream);		printf("k = %d\n", k);		fclose(stream);	}		return 0;	}

	char s[5], psw[] = "password";	int i, k= 0;	for (i=0; !k && i<3; i++) {		printf("Введите пароль: \n"),		gets(s);		if (strcmp(s, psw)) k = 1;	}		if (k) printf("Добро пожаловать! TRUE");	else printf("Ошибка: Неверный пароль! FALSE");

	int x;	short y;

	int a = 15, b = 2;	float c = 1.0F;	float d;	d = c*(a/b);

	char FirstName[100], LastName[100];	int Age;	printf("Введите Ваши имя, фамилию и возраст: \n");	scanf("%[^,]s %s %d", FirstName, LastName, &Age);

	int x;	printf("Введите число от 1 до 7: ");	scanf_s("%d", &x);	switch (x<=5 ? 1 :			x==6 ? 2 : 3)	{	case 1:		printf("Сегодня рабочий день"); 		break;	case 2:		printf("Сегодня суббота"); 		break;	case 3:		printf("Сегодня воскресенье"); 		break;	default:		printf("Ошибка! Вы ввели неверное число");		break;	}

  int a, b, res;  char op;  int f = 1;  printf("Введите 1й операнд: ");  scanf("%d", &a);  printf("Введите знак операции: ");  scanf("%s", &op);  printf("Введите 2й операнд: ");  scanf("%d", &b);  switch (op) {	  case '+': res = a+b; 	  case '-': res = a-b; break;	  case '*': res = a*b; break;	  case '/': res = a/b; break;	  default: 		  printf("Неизвестная операция");		  f = 0;  }  if (f) printf ("Результат: %d", res);

	int num, half, div;	printf("Введите число: ");	scanf_s("%d", &num);	half = num / 2;	div = 2;	do {		if (!(num % div)) printf("%d ", div);		div++;	} while (div <= half);

#include <stdio.h>#define N 10int main(){		int i, sum;	int arr[N] = {3, 4, 5, 4, 4};	for (i = 1, sum = 0; i<N; i++) sum += arr[i];	printf("Сумма элементов: %d\n", sum);	return 0;		}

#include <stdio.h>#define N 5#define M 2int main(){			int i, j, sum=0;	int arr[N][2] = {0,1,2,3,4,5,6,7,8,9};	for (i=0; i<N; i++)	{		for (j=0; j<M; j++)			if (!(arr[i][j]%2)) sum+=arr[i][j];	}		printf("sum = %d\n", sum);	return 0;}

	int n=0, num=10;	char str1[10]="", str2[10]="Lection";	_itoa(num, str1, 10);	strcat(str2, str1);	n = strlen(str2);

	char str1[10] = "Lection";	char str2[10] = "lection";

#include <stdio.h>#include <string.h>#define N 10int main(){			char strLow[N];	int i;	printf("Enter string in low register (%d symbols): \n", N);	scanf("%s", strLow);	for (i=0; i<strlen(strLow); i++)		putchar(strLow[i] - 32);	printf("\n");	return 0;}

#include <stdio.h>#include <string.h>#define N 10int main(){		int i = 0;	char ch;	char str1[N] = "test";	char str2[N] = "";	ch= str1[0];	while (ch!='\0')	{		str2[i] = str1[i];		i++;		ch= str1[i];	}		return 0;}

	int i = 0;	char t1 = 218;	char tr = 191;	char b1 = 192;	char br = 217;	char g = 196;	char v = 179;	printf("%c", t1);	for (i=0; i<32; i++) printf("%c",g);	printf("%c\n", tr);	printf("%c", v);	for (i=0; i<32; i++) printf("%c",' ');	printf("%c\n", v);	printf("%c", b1);	for (i=0; i<32; i++) printf("%c",g);	printf("%c\n", br);

	int x = 99;	int *p1, *p2;	p1 = &x;	p2 = p1;

	char a='A', b='B', c='C';	char *pc;	pc = &a;	c = *pc;	*pc = 'C';	b = a;

		#include <stdio.h>#include <conio.h>int main(){		char str1[10] = "", str2[10] = "";	char *ptr1, *ptr2;	printf("Введите строку: %s", str1);	scanf("%s", str1);	ptr1 = str1;	ptr2 = str2;	while (*ptr1!='\0') {		if (*ptr1=='\0') {			*ptr2 = '\0';			break;		}		*ptr2 = *ptr1;		ptr1++;	}	printf("str2 = %s\n", str2);	return 0;		}	

#include <stdio.h>#include <conio.h>int main(){		char str1[10] = "", str2[10] = "";	char *ptr1, *ptr2;	printf("Введите строку: %s", str1);	scanf("%s", str1);	ptr1 = str1;	ptr2 = str2;	while (ptr1>=str1) {		if (ptr1<str1) *ptr2 = '\0';		*ptr2 = *ptr1;		ptr1--;		ptr2++;	}	printf("str2 = %s\n", str2);	return 0;		}		

  int x = 10, y = 20, z;  int *p1, *p2;  p1 = &x;  p2 = p1;  <Выражение>  z = (x==y) ? (x+y) : (y-x);	

	int i, N, sum = 0;	int arr[] = {3, 2, 4, 5, 1};	int *ptr;	N = sizeof(arr)/sizeof(arr[0]);	ptr = arr;	for (i=0; i<N; i++)		sum += *ptr;

	int m;	char month[3], s[8] = "";	char *season[] = {		"winter",		"spring",		"summer",		"autumn"	};	printf("Enter day of your birthday (MM.DD): ");	scanf("%[^.]s", month);	m = atoi(month);	if ((m==12) || (m<3)) strcpy(s, season[0]);	else		if ((m>2) && (m<6)) strcpy(s, season[1]);		else			if ((m>6) && (m<9)) strcpy(s, season[2]);			else strcpy(s, season[3]);	printf("Your birthday is in %s\n", s);

			int arr1[10] = {1,2,3,4,5};				(1)	int *arr2 = (int *)calloc(10, sizeof(int));		(2)	int *arr3 = (int *)malloc(10*sizeof(int));		(3)	int arr4[][3] = {{1,2,3}, {4,5,6}};			(4)

			int i;	double **m;	m = (double **)calloc(10,sizeof(double *));	for (i=0; i<10; i++)		m[i] = (double *)calloc(5,sizeof(double));

int sq(int a, int x){	int i, res = 1;	for (i=0; i<x; i++)		res*= a;	return res;}int main(void){	int n=4, b = 3, p;	p = sq(n,b);	printf("%d^%d = %d\n", n, b, p);		return 0;}

	int is_in(char *s,  char c)				(1)	{	  while(*s)						(2)		if(*s==c) return 1;				(3)			else s++;					(4)	  return 0;						(5)	}

#include <stdio.h>#include <string.h>int search(char *p[], char *name);				(1)char *names[] = {  "Сергей",  "Юрий",  "Ольга",  "Игорь",  NULL}; int main(void){  if(search(names, "Ольга") != -1)				(2)    printf("Ольга есть в списке.\n");  return 0;}int search(char *p[], char *name)				(3){  int t;  for(t=0; p[t]; ++t)    if(!strcmp(p[t], name)) return t;  return -1;}

#include <stdio.h>#define n 10void fun(int *mas, int k);int main( void ){	int arr[n] = {3,4,5,4,4};	int i;	fun(arr, n);	for (i=0; i<n; i++) 		printf("arr[%d] = %d\n", i, arr[i]);	return 0;}void fun(int *mas, int k){   int i, s = 0;   for (i=0; i<k; i++) mas[i] *= 2;}

#include <stdio.h>#include <stdlib.h>#define n 2#define m 3int sum(int *a, int x, int y);int main( void ){	int i, s;	int a[n][m] = {{1,2,3}, {4,5,6}};		s = sum(a, n, m);	printf("Сумма элементов а: %d\n", s);		return 0;}int sum(int *a, int x, int y){   int i, j, s = 0;   for (i=0; i<x; i++) 	   for (j=0; j<y; j++) s += a[i*y+j];   return s;}

int *sum(int A[], int B[], int n){    int i;	int *ptr = (int *)calloc(n, sizeof(int));     for (i = 0; i < n; i++) ptr[i] = A[i] + B[i];    return ptr;}

void PuzSortInc (int*, int );void PuzSortDec (int*, int);int main (void) {	int A[] = {56, 34, 2, 0, 1, -21, 6, 8, 7};	int i, n, alg;	<Объявление указателя pFun на функции>	n = sizeof(A)/sizeof(A[0]);	printf("Исходный массив: ");	for (i = 0; i < n; i++) printf(" %3d", A[i]);	printf("\nВыберите алгоритм сортировки (1 - \"методом пузырька\" по возрастанию,\		   2 - \"методом пузырька\" по убыванию: ");	scanf("%d", &alg);	switch (alg) {		case 1: pFun = PuzSortInc; break;		case 2: pFun = PuzSortDec; break;		default: printf("ERROR! Такого алгоритма не определено!");	}	if (pFun) {		pFun(A,n);		printf("\nSorted array: ");		for (i = 0; i < n; i++) printf(" %3d", A[i]);	};			return 0;}void PuzSortInc (int* arr, int size){	int i, j, buf; 	for (i = 0; i < size - 1; i++ ) {		for (j = 0; j < size - 1; j++) {			if (arr[j] > arr[j + 1]) {				buf = arr[j];				arr[j] = arr[j+1];				arr[j+1] = buf;			}						}	}}void PuzSortDec (int* arr, int size){	int i, j, buf; 	for (i = 0; i < size - 1; i++ ) {		for (j = 0; j < size - 1; j++) {			if (arr[j] < arr[j + 1]) {				buf = arr[j];				arr[j] = arr[j+1];				arr[j+1] = buf;			}						}	}}

void PuzSortInc (int*, int );void PuzSortDec (int*, int);int main (void) {	int A[] = {56, 34, 2, 0, 1, -21, 6, 8, 7};	int i, n, alg;	void (*pFun) (int*, int) = NULL;	n = sizeof(A)/sizeof(A[0]);	printf("Исходный массив: ");	for (i = 0; i < n; i++) printf(" %3d", A[i]);	printf("\nВыберите алгоритм сортировки (1 - \"методом пузырька\" по возрастанию,\		   2 - \"методом пузырька\" по убыванию: ");	scanf("%d", &alg);	switch (alg) {		case 1: pFun = PuzSortInc; break;		case 2: pFun = PuzSortDec; break;		default: printf("ERROR! Такого алгоритма не определено!"); 	}	pFun(A,n);	printf("\nОтсортированный массив: ");	for (i = 0; i < n; i++) printf(" %3d", A[i]);			return 0;}void PuzSortInc (int* arr, int size){	int i, j, buf; 	for (i = 0; i < size - 1; i++ ) {		for (j = 0; j < size - 1; j++) {			if (arr[j] > arr[j + 1]) {				buf = arr[j];				arr[j] = arr[j+1];				arr[j+1] = buf;			}						}	}}void PuzSortDec (int* arr, int size){	int i, j, buf; 	for (i = 0; i < size - 1; i++ ) {		for (j = 0; j < size - 1; j++) {			if (arr[j] < arr[j + 1]) {				buf = arr[j];				arr[j] = arr[j+1];				arr[j+1] = buf;			}						}	}}

	char str[30], i;	FILE *fp;	if((fp = fopen("g:\\test.txt", "r"))==NULL) {		printf("Ошибка при открытии файла.\n");		exit(1);	}	fgets(str, 30, fp);	i = strlen(str);	fclose(fp);

int main( void ){   FILE *stream;   char line[81];   int  result;   if ( fopen_s( &stream, "g:\\fseek.out", "w+" ) != 0 )   {      printf( "The file fseek.out was not opened\n" );      return -1;   }   fprintf( stream, "Ivanov - 09.06.1980 "                    "Petrov - 10.03.1986 \n"					"Sidorov - 08.11.1985\n");   result = fseek( stream, 20L, SEEK_SET);   if( result )      perror( "Fseek failed" );   else   {      fgets( line, 80, stream );      printf( "%s", line );    }   fclose( stream );   return 0;}

int main( void ){   FILE *stream;   char str[81];   int  result;   if ( fopen_s( &stream, "g:\\list.txt", "r+" ) != 0 )   {      printf( "The file list.txt was not opened\n" );      return -1;   }    result = fseek( stream, -24L, SEEK_END);   if( result )      perror( "Fseek failed" );   else   {      fgets( str, 80, stream );      printf( "%s", str );    }   fclose( stream );   return 0;}

int main(void){  FILE *fp;  char str[30] = "Lection 11";  int k, l, m;  if((fp=fopen("g:\\test.txt", "wt+"))==NULL) {    printf("Ошибка при открытии файла.\n");    exit(1);  }  k = fwrite(str, sizeof(char), strlen(str)-3, fp);  rewind(fp);  l = fread(str, sizeof(char), sizeof(str)/sizeof(char), fp);   m= k+l;  fclose(fp);  return 0;}

struct addr {  char name[30];  char street[40];  char city[20];  char state[3];  unsigned long int zip;} addr_info, binfo;

struct addr{  char name[30];  char street[40];  char city[20];  char state[3];  unsigned long int zip;};

void PrintStruct(char*, int, int);int main (void){	<Объявление структуры Account и переменных acc1, acc2>	acc2 = &acc1;		acc1.account = 346578;	acc1.name = "Ivanov";	acc1.balance = 30000;	PrintStruct(acc1.name, acc1.account, acc1.balance); 	acc2->account = 90005;	acc2->name = "Pertov";	acc2->balance = 46000;	PrintStruct(acc2->name, acc2->account, acc2->balance); 	return 0; }void PrintStruct(char *str, int a, int b){	printf("Name: %s\n", str);	printf("Account: %d\n", a);	printf("Balance: %d\n\n", b);}

int main (void){	struct student { 		char *name;		char *birthday;		int group;	} s1, s2;	int s;		s1.name = "Ivanov";	s1.birthday = "10.03.1985";	s1.group = 1014;	s2.name = "Petrov";	s2.birthday = "08.04.1985";	s2.group = 1309;	s2 = s1;	if (s2.group == s1.group)		printf("Students %s and %s are studying in the same group\n", s1.name, s2.name);	else		printf("Students %s and %s are not studying in the same group\n", s1.name, s2.name);	return 0; }

int main (void){	struct student {    		char *name;  		char *surname; 		int group;         		int ses[5];		double av;		struct student *p;	} st; 	FILE *fp;	int i, sum = 0;	st.name = "Ivan";	st.surname = "Ivanov";	st.group = 1024;	st.ses[0] = 5;	st.ses[1] = 4;	st.ses[2] = 5;	st.ses[3] = 5;	st.ses[4] = 5;	for (i=0; i<5; i++) sum +=st.ses[i];	st.av = sum/5;		if ((fp = fopen("g:\\marks.txt", "w+t")) == 0)		printf("Open file error");	else {		fprintf(fp, "Name: %s %s\n", st.surname, st.name);		fprintf(fp, "Group: %d\n", st.group);		fprintf(fp, "Average mark: %.2f\n\n", st.av);		fclose(fp);	};    return 0; }

int main (void){	struct train_info {    		char nazn[40];  		int numb; 		char time[10];	};	typedef struct train_info train;	train tr[3];		int i = 0, sum = 0, ch=0;	char str[10], search[10];	while(ch!=121) {		printf("\nEnter information about train (Q - quit): \n");		printf("Enter destination of the train: ");		gets(tr[i].nazn);		printf("Enter number of the train: ");		gets(str);		tr[i].numb = atoi(str);		printf("Enter time of scheduled departure: ");		gets(tr[i].time);		++i;		printf("Quit? (y/n): ");		ch = _getche();	};		printf("\n\nEnter train destination: ");	gets(search);	for (i=0; i<3; i++) {		if (strcmp(tr[i].nazn,search)==0) {			printf("\n\tTrain number: %d", tr[i].numb);			printf("\n\tTime: %s", tr[i].time);		}	}	if (i>=3)		printf("There is no train to this destination");    return 0; }

union test {  char ch1[5];  char ch2[2];  char ch3[1];};int main(void){	union test t;	char *str;	strcpy(t.ch1, "test");	t.ch2[0] = 'b';	t.ch3[0] = 'w';	str = t.ch1;	return 0;}

int main(void){	union pw {	  int i;	  double d;	  char ch[2];	} pw = {"y"};		printf("pw.d = %.2f", pw.d);		return 0;}

int main(void){	enum coin { penny, nickel, dime, quarter=100, half_dollar, dollar};	enum coin money;	char name[][12]={	  "penny",	  "nickel",	  "dime",	  "quarter",	  "half_dollar",	  "dollar"	};	money = half_dollar;	printf("%s", name[money]);		return 0;}

int main(void){	typedef enum { ERR_READ, ERR_WRITE, ERR_CONVERT} Err;	Err error;	switch (error) {		case ERR_READ:			printf("Возникла ошибка чтения (ERR_READ)\n");			break;		case ERR_WRITE:			printf("Возникла ошибка записи (ERR_WRITE)\n");			break;		case ERR_CONVERT:			printf("Возникла ошибка преобразования (ERR_CONVERT)\n");			break;		default:			printf("Возникла неизвестная ошибка\n");			break;	};		return 0;}

struct fred {	char x;	int y;	float z;	char str[10]; } mike;

#define MAX 20double sum(double, double);int main (void) {	struct test {		char A[MAX+1]; 		double ax; 		char B[MAX+1]; 		double by;	};	struct test AB;		printf("\nEnter 1st name: ");	gets_s(AB.A, MAX);	printf("\nEnter the first real number: ");	scanf_s("%lf", &AB.ax);	_flushall();	printf("\nEnter 2nd name: ");	gets_s(AB.B, MAX);	printf("\nEnter the second real number: ");	scanf_s("%lf", &AB.by);	printf("\n\nThe sum of two numbers %1.2f and %1.2f, %s and %s: %1.2f\n",			AB.ax, AB.by, AB.A, AB.B, sum(AB.ax, AB.by)); 	return 0; }double sum(double x, double y) {	return (x + y);}

struct struct_type {	int a, b;	char ch;} ;int main(void){	struct struct_type arg;	arg.a = 1000;	f1(arg);	return 0;}

typedef struct {	char fio[30];	int group;	float average;} student;void Init(student*);int main(void){	student s, *st;	int i;	st = &s;	Init(st);		return 0;}void Init(student *st){	printf("\nEnter name: ");	scanf("%s", st->fio);	printf("\nEnter group: ");	scanf("%d", &st->group);	printf("\nEnter average mark: ");	scanf("%f", &st->average);}

void Init(struct student*);void Print(struct student*);int main(void){	struct student {		char fio[30];		int group;		float average;	};	struct student s, *st;	int i;	st = &s;	Init(st);	Print(st);	return 0;}void Init(struct student *st){	printf("\nEnter name: ");	scanf("%s", st->fio);	printf("\nEnter group: ");	scanf("%d", &st->group);	printf("\nEnter average mark: ");	scanf("%f", &st->average);}void Print(struct student *st){	printf("\nName: %s", st.fio);	printf("\nGrouproup: %d", st.group);	printf("\nAverage mark: %.2f", st.average);}

typedef struct sale_struct {	char *title;	int price;} sale;sale Copy(sale);int main(void){	sale s1,s2;	struct sale_struct s3, s4;	s1.title = "Book";	s1.price = 200;	s3.title = "Cake";	s3.price = 60;	return 0;}sale Copy(sale s) {	sale s1;	s1 = s;	return s1;}

typedef struct sale_struct {	char *title;	int price;} sale;

sale Copy(char* t, int p) {	sale s1;	s1.title = t;	s1.price = p;	return s1;}

int main(void){	struct test {		unsigned int  : 3;		unsigned int f1 : 1;		unsigned int f2 : 1;		unsigned int f3 : 1;		unsigned int type : 8;		unsigned int index : 18;	};		int b;	struct test t, *pt;	pt = &t;	pt->f1 = 11;	t.type = 3439;	b = t.f1 + t.type;	printf("b = %d\n", b);	return 0;}

int main(void){	struct Options {		unsigned int  centerX : 1;		unsigned int centerY : 1;		unsigned int shadow : 2;		unsigned int palette : 4;	};		int b;	struct Options t, *pt;	t.shadow = 10;	t.palette = 12;	b = t.shadow + t.palette;	printf("b = %d\n", b);	return 0;}	

void printBits(unsigned int var);int main (void) {	unsigned int number1, number2;	printf("\n The program on demonstration digit-by-digit operator OR ( | ):\n");	printf("\n\t Enter the unsigned number of N1: ");	scanf_s("%u", &number1);	printf("\t Enter the unsigned number of N2: ");	scanf_s("%u", &number2);	printf("\n\t Binary representation of the number of N1 (%u) and\n", number1);	printf("\t Binary representation of the number of N2 (%u):\n", number2);	printBits(number1);	printBits(number2);	printBits(number1 | number2); 	printf("\n\n Press any key: ");	_getch();	return 0;}void printBits(unsigned int var) {	unsigned int b;	unsigned int num = 1 << 31; 	printf("\n\t %10u = ", var);	for (b = 1; b <= 32; ++b) {		printf("%c", var & num ? '1' : '0');		var <<= 1; 		if (b % 8 == 0)			putchar(' ');	} } 

int main(void){	struct test {		unsigned int a : 2;		unsigned int b : 8;	};		int c;	struct test t;	t.b = 255;	t.a = 3;	c = t.b ^ t.a;	printf("c = %d\n", c);	return 0;}	

	a = 6 & 5;	b = 6 | 5;	c = 6 ^ 5;

int main(void){		int date;	int year = 26;	int month = 12;	int day = 31;		year = year << 9;	month = month << 5;	date = day;	date = date | month;	date = date | year;		return 0;}	

extern int x, y;extern char ch;static void func1(void){	y = 100;}int func2(int a){	int b;	b = a;	retun b;}extern void func2(void){	x = y/10;	ch = 'R';}

int c = 9;int sum(int a, int b){	return a+b;}int t = 8;int main(void){	int n=4, m=3, s1, s2;	s1 = sum(n,m);	s2 = mul(n,m);	return 0;}int k = 6;int mul(int a, int b){	return a*b;}

int test();int a = 1;int main (void) {	int b, s;	extern int x;	static int c;	int a;	a = 2;	s = test();	return 0;  }int test() {	int t = a;	return t;}

int min(int, int);int t;int main(void){	int x=-5, y=5, m;	m = min(x,y);	printf("min = %d\n", m);		return 0;}int min(int a, int b){	int m = (a<b) ? a : b;	return m;}

extern int x, y;extern char ch;void func22(void){	y = 100;}void func23(void){	x = y/10;	ch = 'R';}

#define N 7void step(int, int, int);	int map[N][N];	// карта: map[i,j]!=0, если точки i и j соединены	int road[N];	// маршрут - номера точек карты	int incl[N];	// incl[i]==1, если точка с номером i включена в road	int start;	// начальная точка маршрута 	int finish;	// конечная точка маршрута	int i, j;int main (void) {	// инициализация массивов	for (i=0; i<N; i++) road[i] = 0;	for (i=0; i<N; i++) incl[i] = 0;	for (i=0; i<N; i++) 		for (j=0; j<N; j++) map[i][j] = 0;	// ввод значений элементов карты	map[0][1] = 1; map[1][0] = 1; 	map[0][2] = 1; map[2][0] = 1;	map[0][3] = 1; map[3][0] = 1;	map[2][3] = 1; map[3][2] = 1;	map[2][6] = 1; map[6][2] = 1;	map[3][5] = 1; map[5][3] = 1;	map[4][5] = 1; map[5][4] = 1;	map[4][6] = 1; map[6][4] = 1;	map[5][6] = 1; map[6][5] = 1;	printf("Введите через пробел номер начальной и конечной точек: ");	scanf("%d %d", &start, &finish);	road[0] = start;	// внести точку в маршрут	incl[0] = 1;		// пометить точку как включенную	step(start, finish, 2);	return 0;}void step(int s, int f, int p) {	int c;				// номер точки, в которую делается очередной шаг	int i;		if (s==f) {		printf("Путь: ");		for (i=0; i<p-1; i++) printf("%d ", road[i]);		printf("\n");	}	else {		// выбор очередной точки		for (c=0; c<N; c++)			// проверка всех вершин			if (map[s][c]!=0 && incl[c]==0) {				// точка соединена с текущей и не включена в маршрут				road[p] = c;		// добавление вершины в путь				incl[c] = 1;		// пометка вершины как включенной				step(c, f, p+1);				incl[c] = 0;				road[p] = 0;			}	}}

char s[100];int pal(char s[100]);int main(){ 	printf("\nВведите строку: "); 	gets(s);	if (pal(s)) printf("Строка является палиндромом");	else  printf("Строка не является палиндромом");	return 0;}int pal(char s[100]){ 	int l; char s1[100];		if (strlen(s) = 1) return 1;	else {		l=s[0]==s[strlen(s)-1];		strncpy(s1, s+1, strlen(s)-2);		s1[strlen(s)-2]='\0';		return l&&pal(s1);	}}

long fact (int n){    if ( n<1 ) return 1;    else return n*fact(n-1);} 

#define _CRT_SECURE_NO_WARNINGS#include <stdio.h>#include <conio.h>#include <stdlib.h>#include <locale.h>#ifndef ARR	#define ARR	#include "..\arr.txt"#endifint main (void)  {	int i = 0 , j = 0, n;		setlocale (LC_ALL, "rus");	printf("Введите количество человек (от 1 до 3): ");	scanf("%d", &n);    	if (n<1 || n>3) {		printf("Ошибка ввода данных. Нажмите любую клавишу: ");		_getch();		exit(1);	}	#ifdef ARR		for (i=0; i<n; i++)			printf("%d. %s %s\n", i+1, names[i], surnames[i]);	#endif	return 0;}

char *names[] = {"Иван", "Пётр", "Илья"};char *surnames[] = {"Иванов", "Пётров", "Ильин"};

#ifndef ARR#define ARR#include "arr.txt"#endif

#define _CRT_SECURE_NO_WARNINGS#include <stdio.h>#include <conio.h>#include <stdlib.h>#include <locale.h>#ifndef ARR#define ARR#include "arr.txt"#endifint main (void)  {	int i = 0 , j = 0, n;		setlocale (LC_ALL, "rus");	printf("Введите количество человек (от 1 до 3): ");	scanf("%d", &n);    	if (n<1 || n>3) {		printf("Ошибка ввода данных. Нажмите любую клавишу: ");		_getch();		exit(1);	}	#undef ARR	#ifdef ARR		for (i=0; i<n; i++)			printf("%d. %s %s\n", i+1, names[i], surnames[i]);	#endif	return 0;}

char *names[] = {"Иван", "Пётр", "Илья"};char *surnames[] = {"Иванов", "Пётров", "Ильин"};

int main(int argc, char* argv[]){	char name[30];	FILE *f;	f = fopen("g:\\test.txt", "w+");	fprintf(f, "%s\n%s", argv[0], argv[1]);		return 0;}

int main(int argc, char* argv[]){	int n1, n2, m, sum;	m = argc;	n1 = atoi(argv[1]);	n2 = atoi(argv[2]);	sum = n1 + n2;	printf("sum = %d\n", sum);	return 0;}

int main(int argc, char *argv[]){	int t, i;	for(t=0; t<argc-1; ++t) {		i = 0;		while(argv[t][i]) {			putchar(argv[t][i]);			++i;		}		printf("\n");	}	return 0;}

int main(int argc, char *argv[]){	int t;	for(t=0; t<argc; ++t)		printf("%s\n", argv[t]);	return 0;}

#include <stdio.h>#include <conio.h>#include <stdarg.h>void error(int severity, ... );int main( void ){	char err[][30] = {"Сообщение 1", "Сообщение 2"};	int n = -1;		printf("Введите степень критичности ошибки (целое число): ");	scanf("%d", &n);	switch (n) {		case 0: error(0, "Ошибка!", '\0');			break;		case 1: error(0, "Ошибка!", err[0], '\0');			break;		default: error(1, "Ошибка!", err[0], err[1], '\0');	}	return 0;}void error(int severity, ... ){   va_list ap;   va_start(ap, severity);   for (;;) {	   char *p = va_arg(ap, char*);	   if (p == '\0') break;	   printf("%s ", p);   }   va_end(ap);   printf("\n");}

union payment {	char card[10];	int sum;	double date;};

struct struct_type {	int a, b;	char ch;} ;int main(void){	struct struct_type arg;	arg.a = 1000;	f1(&arg);	return 0;}

void PuzSortInc (int*, int );void PuzSortDec (int*, int);int main (void) {	int A[] = {56, 34, 2, 0, 1, -21, 6, 8, 7};	int i, n, alg;	void (*pFun) (int*, int) = NULL;	n = sizeof(A)/sizeof(A[0]);	printf("Исходный массив: ");	for (i = 0; i < n; i++) printf(" %3d", A[i]);	printf("\nВыберите алгоритм сортировки (1 - \"методом пузырька\" по возрастанию,\		   2 - \"методом пузырька\" по убыванию: ");	scanf("%d", &alg);	switch (alg) {		case 1: pFun = PuzSortInc; break;		case 2: pFun = PuzSortDec; break;		default: printf("ERROR! Такого алгоритма не определено!"); 	}		if (pFun) {		pFun(A,n);		printf("\nSorted array: ");		for (i = 0; i < n; i++) printf(" %3d", A[i]);	};			return 0;}void PuzSortInc (int* arr, int size){	int i, j, buf; 	for (i = 0; i < size - 1; i++ ) {		for (j = 0; j < size - 1; j++) {			if (arr[j] > arr[j + 1]) {				buf = arr[j];				arr[j] = arr[j+1];				arr[j+1] = buf;			}						}	}}void PuzSortDec (int* arr, int size){	int i, j, buf; 	for (i = 0; i < size - 1; i++ ) {		for (j = 0; j < size - 1; j++) {			if (arr[j] < arr[j + 1]) {				buf = arr[j];				arr[j] = arr[j+1];				arr[j+1] = buf;			}						}	}}

		#include <stdio.h>#include <conio.h>#include <stdlib.h>#include <string.h>int main(void) {	int n, m;		char *ptr; 	printf("\nEnter a dimention of character array: ");	scanf_s("%d", &n);	_flushall();	ptr = (char *)malloc((n+1)*sizeof(char));	if (!ptr) {		printf("\nERROR! Out of memmory (error in malloc() function). Press any key...");		_getch(); 		exit(1); 	}	printf("Enter a character array (not more than %d characters): ", n);	gets_s(ptr, n+1);	m = strlen(ptr);	strcat_s(ptr, m+2,  "!");	printf("\nStart line and character \"%c\": %s", '!', ptr);		free (ptr);	printf("\n\nPress any key: ");	_getch();	return 0; }

void PuzSortInc (int*, int );void PuzSortDec (int*, int);int main (void) {	int A[] = {56, 34, 2, 0, 1, -21, 6, 8, 7};	int i, n, alg;	<Объявление указателя pFun на функции>	n = sizeof(A)/sizeof(A[0]);	printf("Исходный массив: ");	for (i = 0; i < n; i++) printf(" %3d", A[i]);	printf("\nВыберите алгоритм сортировки (1 - \"методом пузырька\" по возрастанию,\		   2 - \"методом пузырька\" по убыванию: ");	scanf("%d", &alg);	switch (alg) {		case 1: (*pFun[0])(A, n); break;		case 2: (*pFun[1])(A, n); break;		default: printf("ERROR! Такого алгоритма не определено!");	}    printf("\nSorted array: ");	for (i = 0; i < n; i++) printf(" %3d", A[i]);			return 0;}void PuzSortInc (int* arr, int size){	int i, j, buf; 	for (i = 0; i < size - 1; i++ ) {		for (j = 0; j < size - 1; j++) {			if (arr[j] > arr[j + 1]) {				buf = arr[j];				arr[j] = arr[j+1];				arr[j+1] = buf;			}						}	}}void PuzSortDec (int* arr, int size){	int i, j, buf; 	for (i = 0; i < size - 1; i++ ) {		for (j = 0; j < size - 1; j++) {			if (arr[j] < arr[j + 1]) {				buf = arr[j];				arr[j] = arr[j+1];				arr[j+1] = buf;			}						}	}}

typedef struct {	char fio[30];	int group;	float average;} student;void Init(student*);int main(void){	student s, *st;	int i;	st = &s;	Init(st);	<Вывод данных на экран>		return 0;}void Init(student *st){	printf("\nEnter name: ");	scanf("%s", st->fio);	printf("\nEnter group: ");	scanf("%d", &st->group);	printf("\nEnter average mark: ");	scanf("%f", &st->average);}

union payment {	char card[25];	int sum;	double date;};

int f();static int d = 5, e = 8;int main(void){	int n = 1, m = 1;	int s;	s = f();		return 0;}int f(){	int p;	static int c = 0;	p = c;	printf("d = %d",d);	return p;}

	int i;	char str[10] = "Test", *p1, *p2;	p1 = str;	p2 = p1;	p2--;	p1++;	i = 2 * (p1 - p2);

	char FirstName[100], LastName[100];	int Age;	printf("Введите Ваши имя, фамилию и возраст: \n");	scanf("%s %[^,]s %d", FirstName, LastName, &Age);	printf("Приятно познакомиться, %s %s!\n", FirstName, LastName);

	int x, n = 1;	while (n<=10)	{		x = n*n;		printf("%d %d\n", n, x);	}

int num; do {	scanf("%d", &num);} while (num > 100);	

	int cond;	int A = 1;	cond = (A >= 100) && (A <= 150);

  int a, b, res = 0;  char op;  int f = 1;  printf("Введите 1й операнд: ");  scanf("%d", &a);  printf("Введите знак операции: ");  scanf("%s", &op);  printf("Введите 2й операнд: ");  scanf("%d", &b);  switch (op) {	  case '+': res = a+b; break;	  case '-': res = a-b; break;	  case '*': res = a*b; break;	  case '/': res = a/b; break;	  default: 		  printf("Неизвестная операция\n");		  f = 0;  }  if (f) printf ("Результат: %d", res);

  int n = 1;					(1)  while (n<=10)					(2)  {	  if (n%2) 				(3)		  printf("%d\n", n);		(4)			n++;			(5)	  printf("%d\n", n);			(6)	  n++;					(7)  }

#include <stdio.h>#define N 5int main(){		int m, i;	int arr[N] = {3, 2, 4, 5, 1};		m = 1;	for (i=1; i<N; i++)		if (arr[i]>arr[m]) m = i;	printf("a[m] = %d", arr[m]);	return 0;		}

	int i, j, size;	int arr[5][2] = {0,1,2,3,4,5,6,7,8,9};	size = sizeof(arr)/sizeof(arr[0][0]);

	char s[5], psw[] = "password";	int i, k= 0;	for (i=0; !k && i<3; i++) {		printf("Введите пароль: \n"),		gets(s);		if (strcmp(s, psw)) k = 1;	}		if (k) printf("Добро пожаловать! TRUE");	else printf("Ошибка: Неверный пароль! FALSE");

#include <stdio.h>#define N 7int main(){		int i, j, k, buf;	char arr[N] = "Lection";	for (i=0; i<N; i++)		for (j=0; j<N-1; j++)		{			if (arr[j] > arr[j+1])			{				buf = arr[j];				arr[j] = arr[j+1];				arr[j+1] = buf;			}		};	for (k=0; k<N; k++)		printf("%c ", arr[k]);	return 0;		}

#include <stdio.h>#include <conio.h>int main(){		int n=0, i=0, j=0;	char ch, str[30]="";	printf("Введите строку: ");	scanf("%s", str);	printf("Введите символ: ");	ch = _getche();	for(i=0; i<strlen(str); i++)	{		for (j=0; j<strlen(str); j++) {			if(str[j]==str[i]) n++;		}		printf("\n%c - %d", str[i], n);		n = 0;	}	printf("\n");	return 0;		}

	char a='A', b='B', c='C';	char *pc1, *pc2;	pc1 = &c;	pc2 = pc1;	c = b;	*pc2 = a;

		#include <stdio.h>#include <conio.h>int main(){	  int i;  char a[10] = "Test", b[10] = "";  char *pa = a;  char *pb = b;  for (i=0; i<strlen(a); i++)	  *pb++ = *pa++;  printf("a = %s\n", a);    printf("b = %s\n", b);    return 0;}

#include <stdio.h>#include <conio.h>int main(){		char str1[10] = "", str2[10] = "";	char *ptr1, *ptr2;	printf("Введите строку: %s", str1);	scanf("%s", str1);	ptr1 = str1;	ptr2 = str2;	while (ptr1>=str1) {		if (ptr1<str1) *ptr2 = '\0';		*ptr2 = *ptr1;		ptr1--;		ptr2++;	}	printf("str2 = %s\n", str2);	return 0;		}		

	int  x = 100, *ptr1,  **ptr2;	ptr1 = &x;	ptr2 = &ptr1;	

	int m[][5] = {{1,2,3,4,5}, {6,7,8,9,10}, {11,12,13,14,15}};	int *ptr;	int i, j, n, k, el;	n = sizeof(m)/sizeof(m[0]);	k = sizeof(m[0])/sizeof(m[0][0]);	ptr = &m[0][0];

		#include <stdio.h>#include <stdlib.h>#define N 10int main(void){	int i;	int *arr;		arr = (int *)calloc(N, sizeof(int));	if (!arr) {		printf("\nERROR! Out of memory in calloc() function. Press any key: ");		_getch(); 		exit(1); 	};	for (i=0; i<N+2; i++) {		arr[i] = i+1;		printf("arr[%d] = %d\n", i, arr[i]);	}	free(arr);	return 0;}

		#include <stdio.h>#include <stdlib.h>#define N 10int main(void){	int i;	int *arr;	arr = (int *)realloc(arr, (N+2)*sizeof(int));	for (i=0; i<N; i++) {		arr[i] = i+1;		printf("arr[%d] = %d\n", i, arr[i]);			}	if (!arr) {		printf("\nERROR! Out of memory in realloc() function. Press any key: ");		_getch(); 		exit(1); 	};	for (i=N; i<N+2; i++) {		arr[i] = i+1;		printf("arr[%d] = %d\n", i, arr[i]);	}	free(arr);	return 0;}

	int is_in(char *s,  char c)				(1)	{	  while(*s)						(2)		if(*s==c) return 1;				(3)			else s++;					(4)	  return 0;						(5)	}

int* fun() {	int a = 10;	return &a;}

void swap(int *pa, int *pb){	int temp;	temp = *pa;	*pa = *pb;	*pb = temp;}

#include <stdio.h>#define n 10void fun(int *mas, int k);int main( void ){	int arr[n] = {3,4,5,4,4};	int i;	fun(arr, n);	for (i=0; i<n; i++) 		printf("arr[%d] = %d\n", i, arr[i]);	return 0;}void fun(int *mas, int k){   int i, s = 0;   for (i=0; i<k; i++) mas[i] *= 2;}

int main (void) {	double (*pFunc) (double);	int c = 1;	double y;	while(1) {		printf("Выберите функцию (0-выход): 1-sqrt, 2-sin, 3-tan\n");		scanf("%d", &c);		switch(c) {			case 1: pFunc = sin; break;			case 2: pFunc = sqrt; break;			case 3: pFunc = tan; break;			case 0: return;			default: continue;		}			y = pFunc(1.1);		printf("f(1.1) = %.2f\n", y);	}			return 0;}

#include <stdio.h>#include <math.h>#include <time.h>#include <string.h>void AddToLog(FILE*, char*);char* GenerateFileName();int main (void) {	FILE *fp;	char *strFile, strFn[30] = "";	double (*pFunc) (double);	int c = 1;	double y;	strFile = GenerateFileName();	strcpy(strFn, strFile);	<Открытие файла>	while(1) {		printf("Выберите функцию (0-выход): 1-sqrt, 2-sin, 3-tan\n");		scanf("%d", &c);		switch(c) {			case 1: 				pFunc = sqrt; 				AddToLog(fp, "Пользователь выбрал функцию 1 (вычисление квадратного корня)\n");				break;			case 2: 				pFunc = sin; 				AddToLog(fp, "Пользователь выбрал функцию 2 (вычисление синуса)\n");				break;			case 3: 				pFunc = tan; 				AddToLog(fp, "Пользователь выбрал функцию 3 (вычисление тангенса)\n");				break;			case 0: 				AddToLog(fp, "Пользователь завершил выбор функции\n\n");				printf("Лог сохранен в файл %s\n", strFn);				return;			default: 				AddToLog(fp, "Пользователь задал неверный номер функции\n\n");				continue;		}			y = pFunc(1.1);		AddToLog(fp, "Вычислено значение выбранной функции\n");		printf("f(1.1) = %.2f\n", y);		AddToLog(fp, "Результат вычисления выведен на экран\n");	}	if (fp != NULL) fclose(fp);		return 0;}void AddToLog(FILE *fp, char *str){	if (fp != NULL) fputs(str, fp);}char* GenerateFileName(){	char strTime[10] = "";	char strDate[10] = "";	char strFile[30] = "g:\\log_";	char *token;	_strdate(strDate);	_strtime(strTime);	token = strtok(strDate, "/");	while( token != NULL ) {		strncat(strFile,token,2);		token = strtok( NULL, "/" );	}	strncat(strFile,"_",1);	token = strtok(strTime, ":");	while( token != NULL ) {		strncat(strFile,token,2);		token = strtok( NULL, "/" );	}	strncat(strFile,".txt",4);}

void PrintStruct(char*, int, int);int main (void){	<Объявление структуры Account и переменных acc1, acc2>	acc2 = &acc1;		acc1.account = 346578;	acc1.name = "Ivanov";	acc1.balance = 30000;	PrintStruct(acc1.name, acc1.account, acc1.balance); 	acc2->account = 90005;	acc2->name = "Pertov";	acc2->balance = 46000;	PrintStruct(acc2->name, acc2->account, acc2->balance); 	return 0; }void PrintStruct(char *str, int a, int b){	printf("Name: %s\n", str);	printf("Account: %d\n", a);	printf("Balance: %d\n\n", b);}

int main (void){	struct stud {    		char *name;  		char *surname; 		int age;         		double av_mark; 	}; 	<Объявление структуры group и переменной gr>            	gr.number = 3;	gr.quantity = 21;	gr.student.name = "Ivan";	gr.student.surname = "Ivanov";	gr.student.age = 20;	gr.student.av_mark = 4.25;	printf("Group Number: %d\nThe number of students in the group: %d\n", gr.number, gr.quantity);	printf("%s %s - %1.2f", gr.student.surname, gr.student.name, gr.student.av_mark);    return 0; }

#define MAX 20double sum(double, double);int main (void) {	struct test {		char A[MAX+1]; 		double ax; 		char B[MAX+1]; 		double by;	};	struct test AB;		printf("\nEnter 1st name: ");	gets_s(AB.A, MAX);	printf("\nEnter the first real number: ");	scanf_s("%lf", &AB.ax);	_flushall();	printf("\nEnter 2nd name: ");	gets_s(AB.B, MAX);	printf("\nEnter the second real number: ");	scanf_s("%lf", &AB.by);	printf("\n\nThe sum of two numbers %1.2f and %1.2f, %s and %s: %1.2f\n",			AB.ax, AB.by, AB.A, AB.B, sum(ax, by)); 	return 0; }double sum(double x, double y) {	return (x + y);}

struct struct_type {  int a, b;  char ch;} ;struct struct_type2 {  int a, b;  char ch;} ;void f1(struct struct_type2 parm);int main(void){  struct struct_type arg;  arg.a = 1000;  f1(arg);   return 0;}void f1(struct struct_type2 parm){  printf("%d", parm.a);}

typedef struct {	char fio[30];	char phone[20];	int age;} note;note Init(char*, char*, int);void Print(note*);void Modify(note);int main(void){	note n[3], *pn;	char *strName[3] = {"Ivanov I.", "Pertov P.", "Sidorov S."};	char *strPhone[3] = {"12-34-56", "78-90-12", "34-56-78"};	int i, age = 25;	for (i=0; i<3; i++) {		n[i] = Init(strName[i], strPhone[i], age+i);		pn = &n[i];		Print(pn);	}	Modify(n[0]);	pn = &n[0];	Print(pn);	return 0;}note Init(char* f, char* p, int a){	note n, *pn;	pn = &n;	strcpy(pn->fio, f);	strcpy(pn->phone, p);	pn->age = a;	return n;}void Print(note *pn){	printf("\nName: %s", pn->fio);	printf("\nPhone: %s", pn->phone);	printf("\nAge: %d\n", pn->age);}void Modify(note n) {	strcpy(n.fio, "Vasiliev V.");	strcpy(n.phone, "89-01-23");	n.age = 30;}

void printBits(unsigned int var);int main (void) {	unsigned int number, mask;	printf("The program on demonstration digit-by-digit operation And ( & )\n");	printf("Enter a whole number of unsigned: ");	scanf_s("%u", &number);	printf("Enter the number of unsigned-mask: ");	scanf_s("%u", &mask);	printf("Binary representation of the starting number(%u) and\n", number);	printf("Binary representation of the number-masks (%u):\n", mask);	printBits(number);	printBits(mask);	printBits(number & mask); 	return 0; }void printBits(unsigned int var) {	unsigned int b;	unsigned int mask = 1 << 15; 	printf("\n%10u = ", var);	for (b = 1; b <= 16; ++b) 	{		printf("%c", var & mask ? '1' : '0');		var <<= 1; 		if (b % 8 == 0)			putchar(' ');	}} 	

	a = 6 & 5;	b = 6 | 5;	c = 6 ^ 5;

int c = 9;int sum(int a, int b){	return a+b;}int t = 8;int main(void){	int n=4, m=3, s1, s2;	s1 = sum(n,m);	s2 = mul(n,m);	return 0;}int k = 6;int mul(int a, int b){	return a*b;}

int main (void) {		printf("a = %d; b = %d\n", a, b);	printf("Press any key: ");	_getch();	return 0;  }int a = 33, b = 34;

int test();int a = 1;int main (void) {	int b, s;	extern int x;	static int c;	s = test();	return 0;  }int test() {	int t = a;	return t;}int x = 4;

int min(int, int);int t;int main(void){	int x=-5, y=5, m;	m = min(x,y);	printf("min = %d\n", m);		return 0;}int min(int a, int b){	int m = (a<b) ? a : b;	return m;}

long fact(long n) {	return (n>1) ? n * fact(n-1) : 1;}

long fact (int n){    if ( n<1 ) return 1;    else return n*fact(n-1);} 

int Sum(int x, int step, int n){         if (n==1) return(x);        else return(Sum(x, step, n-1)+step);}int main(){         int x, s, n;		int pr;		printf("Введите первый член, число элементов и разность прогрессии:");		scanf("%d %d %d", &x, &n, &s);        <Вызов функции sum()>		printf("pr = %d", pr);		return 0;} 

#include <stdio.h> #define	SQR(x)	(x*x)int main(){ 	int x, y=2;	x = SQR(y+1);	printf("x = %d", x);	return 0;} 

#ifndef HEADER_INCLUDED#include "arr.h"#define HEADER_INCLUDED#enif

#include <stdio.h>#include <conio.h>#include <stdarg.h>#include <stdlib.h>#include <locale.h>void error(int severity, ... );int main(int argc, char* argv[]){	char err[][30] = {"Сообщение1", "Сообщение2"};	int n;		setlocale (LC_ALL, "rus");	n = atoi(argv[1]);	switch (n) {		case 0: error(0, "Ошибка!", '\0');			break;		case 1: error(0, "Ошибка!", err[0], '\0');			break;		default: error(1, "Ошибка!", err[0], err[1], '\0');	}	return 0;}void error(int severity, ... ){   va_list ap;   va_start(ap, severity);   for (;;) {	   char *p = va_arg(ap, char*);	   if (p == '\0') break;	   printf("%s ", p);   }   va_end(ap);   printf("\n");}

int main(int argc, char* argv[]){	int n1, n2, m, sum;	m = argc;	n1 = atoi(argv[1]);	n2 = atoi(argv[2]);	sum = n1 + n2;	printf("sum = %d\n", sum);	return 0;}

int main(int argc, char *argv[]){	int disp, count;	setlocale (LC_ALL, "rus");	if(argc<2) {		printf("В командной строке на задано число\n");		exit(1);	}	if(argc==3 && !strcmp(argv[2], "display")) disp = 1;	else disp = 0;	for(count=atoi(argv[1]); count; --count)		if(disp) printf("%d ", count);	putchar('\a');	printf("Счет закончен");	return 0;}

int main(void){	typedef enum { ERR_READ, ERR_WRITE, ERR_CONVERT} Err;	Err error;	switch (error) {		case ERR_READ:			printf("Возникла ошибка чтения (ERR_READ)\n");			break;		case ERR_WRITE:			printf("Возникла ошибка записи (ERR_WRITE)\n");			break;		case ERR_CONVERT:			printf("Возникла ошибка преобразования (ERR_CONVERT)\n");			break;		default:			printf("Возникла неизвестная ошибка\n");			break;	};		return 0;}

int *sum(int A[], int B[], int n){    int i;	int *ptr = (int *)calloc(n, sizeof(int));     for (i = 0; i < n; i++) ptr[i] = A[i] + B[i];    return ptr;}

#include <stdio.h>#include <conio.h>#define N 10int main(){		int i=0;	char arr[N] = "";	printf("Last Name: ");	while (i<N) {		arr[i] = _getche();		if (arr[i]==13) break;		i++;	};	printf("\nYou have entered Last Name: %s", arr);	return 0;		}

			int arr1[10] = {1,2,3,4,5};				(1)	int *arr2 = (int *)calloc(10, sizeof(int));		(2)	int *arr3 = (int *)malloc(10*sizeof(int));		(3)

int main(int argc, char *argv[]){	int disp, count;	setlocale (LC_ALL, "rus");	if(argc<2) {		printf("В командной строке на задано число\n");		exit(1);	}	if(argc==3 && !strcmp(argv[2], "display")) disp = 1;	else disp = 0;	for(count=atoi(argv[1]); count; --count)		if(disp) printf("%d ", count);	putchar('\a');	printf("Счет закончен");	return 0;}

#include <stdio.h>#define n 5void fun(int *mas, int k);int sum(int *mas, int k);int main( void ){	int arr[n] = {3,4,1,2};	int i, s;	fun(arr, n);	s = sum(arr, n);	return 0;}void fun(int *mas, int k){   int i, s = 0;   for (i=0; i<k; i++) ++mas[i];}int sum(int *mas, int k){   int i, s = 0;   for (i=0; i<k; i++) s += mas[i];   return s;}

	for(t=0; t<SOME_VALUE; t++) ;

	int cond;	int A = 1;	cond = (A >= 100) && (A <= 150);

	int arr[5][2] = {0,1,2,3,4,5,6,7,8,9};	size = sizeof(arr)/sizeof(arr[0]);

	char str1[10] = "Course";	char str2[] = "Lection";	char str3[7] = "Example";

	char str1[10] = "Lection";	char str2[10] = "lection";

			for (i=0; i<5; i++) free(m[i]);	free(m);

			int (*p)[10]; 	p = malloc(40*sizeof(int));

#include <stdio.h>#include <stdarg.h>int average(int first, ... );int main( void ){	int x;	<Вызов фукнции average()>;	return 0;}int average( int first, ... ){   int count = 0, sum = 0, i = first;   va_list marker;   va_start(marker, first);   while( i != -1 ) {      sum += i;      count++;      i = va_arg(marker, int);   }   va_end(marker);   return( sum ? (sum / count) : 0 );}

#include <stdio.h>#include <conio.h>#include <stdarg.h>void error(int severity, ... );int main( void ){	char err[][30] = {"Сообщение 1", "Сообщение 2"};	int n = -1;		printf("Введите степень критичности ошибки (целое число): ");	scanf("%d", &n);	switch (n) {		case 0: error(0, "Ошибка!", '\0');			break;		case 1: error(0, "Ошибка!", err[0], '\0');			break;		default: error(1, "Ошибка!", err[0], err[1], '\0');	}	return 0;}void error(int severity, ... ){   va_list ap;   va_start(ap, severity);   for (;;) {	   char *p = va_arg(ap, char*);	   if (p == '\0') break;	   printf("%s ", p);   }   va_end(ap);   printf("\n");}

char *xgets(char *s){  char ch, *p;  int t;  p = s;   for(t=0; t<80; ++t){    ch = getchar();    switch(ch) {      case '\n':        s[t] = '\0';         return p;      case '\b':        if(t>0) t--;        break;      default:        s[t] = ch;    }  }  s[79] = '\0';  return p;}

char *xgets(char *s){  char ch, *p;  int t;  p = s;   for(t=0; t<80; ++t){    ch = getchar();    switch(ch) {      case '\n':        s[t] = '\0';        return p;      case '\b':        if(t>0) t--;        break;      default:        s[t] = ch;    }  }  s[79] = '\0';  return p;}

#include <stdio.h>#include <math.h>#include <time.h>#include <string.h>void AddToLog(FILE*, char*);char* GenerateFileName();int main (void) {	FILE *fp;	char *strFile, strFn[30] = "";	double (*pFunc) (double);	int c = 1;	double y;	strFile = GenerateFileName();	strcpy(strFn, strFile);	<Открытие файла>	while(1) {		printf("Выберите функцию (0-выход): 1-sqrt, 2-sin, 3-tan\n");		scanf("%d", &c);		switch(c) {			case 1: 				pFunc = sqrt; 				AddToLog(fp, "Пользователь выбрал функцию 1 (вычисление квадратного корня)\n");				break;			case 2: 				pFunc = sin; 				AddToLog(fp, "Пользователь выбрал функцию 2 (вычисление синуса)\n");				break;			case 3: 				pFunc = tan; 				AddToLog(fp, "Пользователь выбрал функцию 3 (вычисление тангенса)\n");				break;			case 0: 				AddToLog(fp, "Пользователь завершил выбор функции\n\n");				printf("Лог сохранен в файл %s\n", strFn);				return;			default: 				AddToLog(fp, "Пользователь задал неверный номер функции\n\n");				continue;		}			y = pFunc(1.1);		AddToLog(fp, "Вычислено значение выбранной функции\n");		printf("f(1.1) = %.2f\n", y);		AddToLog(fp, "Результат вычисления выведен на экран\n");	}	if (fp != NULL) fclose(fp);		return 0;}void AddToLog(FILE *fp, char *str){	if (fp != NULL) fputs(str, fp);}char* GenerateFileName(){	char strTime[10] = "";	char strDate[10] = "";	char strFile[30] = "g:\\log_";	char *token;	_strdate(strDate);	_strtime(strTime);	token = strtok(strDate, "/");	while( token != NULL ) {		strncat(strFile,token,2);		token = strtok( NULL, "/" );	}	strncat(strFile,"_",1);	token = strtok(strTime, ":");	while( token != NULL ) {		strncat(strFile,token,2);		token = strtok( NULL, "/" );	}	strncat(strFile,".txt",4);}

int main( void ){   FILE *stream;   char line[81];   int  result;   if ( fopen_s( &stream, "g:\\fseek.out", "w+" ) != 0 )   {      printf( "The file fseek.out was not opened\n" );      return -1;   }   fprintf( stream, "Ivanov - 09.06.1980 \n"                    "Petrov - 10.03.1986 \n"					"Sidorov - 08.11.1985\n");   result = fseek( stream, -22L, SEEK_END);   if( result )      perror( "Fseek failed" );   else   {      printf( "File pointer is set to middle of first line.\n" );      fgets( line, 80, stream );      printf( "%s", line );    }   fclose( stream );}

int main(void){  FILE *fp;  char str[30] = "Lection 11";  if((fp=fopen("g:\\test.txt", "wt+"))==NULL) {    printf("Ошибка при открытии файла.\n");    exit(1);  }  fwrite(str, sizeof(char), strlen(str)-3, fp);    rewind(fp);  fread(str, sizeof(char), sizeof(str)/sizeof(char), fp);    fclose(fp);  return 0;}

int main( void ){   FILE *stream;   char str[81];   int  result;   if ( fopen_s( &stream, "g:\\list.txt", "r+" ) != 0 )   {      printf( "The file list.txt was not opened\n" );      return -1;   }    result = fseek( stream, 0L, SEEK_END);   if( result )      perror( "Fseek failed" );   else   {      fputs( "\n5. NEC MultiSync EX231W - 10490 rub.", stream );      printf( "%s", str );    }   fclose( stream );   return 0;}

struct addr {  char name[30];  char street[40];  char city[20];  char state[3];  unsigned long int zip;} addr_info, binfo;

struct Worker{  char fio[30];  int date, code;};

int main (void){	struct stud {    		char *name;  		char *surname; 		int age;         		double av_mark; 	}; 	<Объявление структуры group и переменной gr>            	gr.number = 3;	gr.quantity = 21;	gr.student.name = "Ivan";	gr.student.surname = "Ivanov";	gr.student.age = 20;	gr.student.av_mark = 4.25;	printf("Group Number: %d\nThe number of students in the group: %d\n", gr.number, gr.quantity);	printf("%s %s - %1.2f", gr.student.surname, gr.student.name, gr.student.av_mark);    return 0; }

int main (void){	typedef struct {    		char nazn[40];  		int numb; 		char time[10];	} train, train_info;	train_info ti[3];	train tr[3];		int i = 0, sum = 0, ch=0;	char str[10], search[10];	while(ch!=121) {		printf("\nEnter information about train (Q - quit): \n");		printf("Enter destination of the train: ");		gets(tr[i].nazn);		printf("Enter number of the train: ");		gets(str);		tr[i].numb = atoi(str);		printf("Enter time of scheduled departure: ");		gets(tr[i].time);		++i;		printf("Quit? (y/n): ");		ch = _getche();	};		printf("\n\nEnter train destination: ");	gets(search);	for (i=0; i<3; i++) {		if (strcmp(tr[i].nazn,search)==0) {			printf("\n\tTrain number: %d", tr[i].numb);			printf("\n\tTime: %s", tr[i].time);		}	}	if (i>=3)		printf("There is no train to this destination");    return 0; }

union test {  char ch1[5];  char ch2[2];  char ch3[1];};int main(void){	union test t;	char *str;	t.ch3[0] = 'w';	strcpy(t.ch2, "be");	strcpy(t.ch1, "test");	t.ch1[2] = '\0';	str = t.ch2;	return 0;}

typedef struct sale_struct {	char *title;	int price;} sale;

int main(void){	struct test {		unsigned int  : 3;		unsigned int f1 : 1;		unsigned int f2 : 1;		unsigned int f3 : 1;		unsigned int type : 8;		unsigned int index : 18;	};		int a : 4, b;	struct test t;	t.type = 3439;	b = a + t.type;	//printf("t.type = %d\n", t.type);	return 0;}		

int f();static int d = 5, e = 8;int main(void){	int n = 1, m = 1;	int s;	s = f();		return 0;}int f(){	int p;	static int c = 0;	p = c;	printf("d = %d",d);	return p;}

extern int x, y;extern char ch;void func22(void){	y = 100;}void func23(void){	x = y/10;	ch = 'R';}

int summa(int N, int a[6]);int main(){	int i,n;	int a[6] = {8, 65, 10, 2, 4, 1};	n = sizeof(a)/sizeof(a[0]);	printf("Сумма: %d", summa(n-1, a));}int summa(int N, int a[6]){	if (N==0) return a[0]; 	else return a[N]+summa(N-1, a);}

int main(){     char a, b;	printf("Введите два символа (через пробел): ");	scanf("%c %c", &a, &b);	printf("Наибольшим числом является %c", MAX(a, b));	return 0;} 

int main(int argc, char *argv[]){	int t, i;	for(t=0; t<argc; ++t) {		i = 0;		while(argv[t][i]) {			putchar(argv[t][i]);			++i;		}		printf("\n");	}	return 0;}

int main(int argc, char *argv[]){	int t;	for(t=0; t<argc; ++t)		printf("%s\n", argv[t]);	return 0;}

	char str[30], i;	FILE *fp;	if((fp = fopen("g:\\test.txt", "r"))==NULL) {		printf("Ошибка при открытии файла.\n");		exit(1);	}	fgets(str, 30, fp);	i = strlen(str);	fclose(fp);

			int x;	printf("Угадайте число:\n");	for (x=0; x!=123; ) 		scanf("%d", &x);

int main(int argc, char* argv[]){	char name[30];	FILE *f;	f = fopen("g:\\test.txt", "w+");	fprintf(f, "%s\n%s", argv[0], argv[1]);		return 0;}

long fact(long n) {	if (n==0 || n==1) return 1;	return (n * fact(n-1));}

struct addr{  char name[30];  char street[40];  char city[20];  char state[3];  unsigned long int zip;};

#include <stdio.h>#define N 11int main(){			int i;	int arr[N][2];	for (i=1; i<N; i++)	{		arr[i][1] = i;		arr[i][2] = i*i;	}	for (i=1; i<N; i++)		printf("%d,%d\n", arr[i][1], arr[i][2]);	return 0;		}

	int size1, size2, size3;	int arr[5][2] = {0,1,2,3,4,5,6,7,8,9};	size1 = sizeof(arr)/sizeof(arr[0][0]);	size2 = sizeof(arr)/sizeof(arr[0]);	size3 = sizeof(arr);	

	int x = 99, y = 100, z;	int *p1, *p2, *p3;	p1 = &x;	p2 = &y;	p3 = p2;	x = y;	z = *p1 + *p2 + *p3;

	int lec = 7, qst = 11;	int *const plec = &lec;	int *pqst;	pqst = &qst;	(*plec)++;	printf("Number of the next lection is %d\n", lec );	

  int x = 10, y = 20, z;  int *p1, *p2;  p1 = &x;  p2 = p1;  <Выражение>  z = (x==y) ? (x+y) : (y-x);	

	int m[][5] = {{1,2,3,4,5}, {6,7,8,9,10}, {11,12,13,14,15}};	int *ptr;	int i, j, n, k, el;	n = sizeof(m)/sizeof(m[0]);	k = sizeof(m[0])/sizeof(m[0][0]);	ptr = &m[0][0];

int main (void) {	enum month {january = 1, february, march, april, may, 				june,july, august, september, october, november, 				december } aMonth;	int days;	printf("\n Enter the number of the month (1 - 12): ");	scanf_s("%d", &aMonth);	switch (aMonth) {		case january:		case march:		case may:		case july:		case august:		case october:		case december:			days = 31;			break;			case april:		case june:		case september:		case november:			days = 30;			break;		case february:			days = 28;			break;		default:			printf("\n\t Wrong number of the month\n");			days = 0;			break; 	}	if (days)	printf("\n The number of days of the month: %d\n", days);	if (aMonth == "february")	printf("\n ... or 29 if it is a leap year\n");	return 0; }

int main(void){	struct Options {		unsigned int  centerX : 1;		unsigned int centerY : 1;		unsigned int shadow : 2;		unsigned int palette : 4;	};		int b;	struct Options t, *pt;	t.shadow = 10;	t.palette = 10;	b = t.shadow + t.palette;	printf("b = %d\n", b);	return 0;}	

int main(void){	struct test {		unsigned int a : 2;		unsigned int b : 8;	};		int c;	struct test t;	t.b = 255;	t.a = t.b & 3;	printf("t.a = %d\n", t.a);	return 0;}	

	int year = 26;	year = year << 9;	

extern int x, y;extern char ch;void func22(void){	y = 100;}void func23(void){	x = y/10;	ch = 'R';}

char *names[] = {"Иван", "Пётр", "Илья"};char *surnames[] = {"Иванов", "Пётров", "Ильин"};

	char ch = 'a';	int a;	float b;	double c = 4.5;

	int x = 15, y = 2;	float z;	z = x/y;	printf("z = %f\n", z);

	int size1, size2, size3;	int arr[5][2] = {0,1,2,3,4,5,6,7,8,9};	size1 = sizeof(arr)/sizeof(arr[0][0]);	size2 = sizeof(arr)/sizeof(arr[0]);	size3 = sizeof(arr);	

#include <stdio.h>#include <string.h>#define N 10int main(){			char ch, strLow[N] = "test";	int i = 0;	ch= strLow[0];	while (ch!='\0')	{		putchar(strLow[i] - 32);		i++;		ch= strLow[i];	}	printf("\n");	return 0;}

#include <stdio.h>int main( void ){   FILE *stream;   char list[30];   int  i, numread, numwritten;   if( (stream = fopen("g:\\fread.out", "w+t")) != NULL )   {      for ( i = 0; i < 26; i++ )         list[i] = (char)('z' - i);       numwritten = fwrite( list, sizeof( char ), 26, stream );      printf( "Wrote %d items\n", numwritten );      fclose( stream );   }   else      printf( "Problem opening the file\n" );   if( (stream = fopen("g:\\fread.out", "r+t" )) != NULL )   {       numread = fread( list, sizeof( char ), 26, stream );      printf( "Number of items read = %d\n", numread );      printf( "Contents of buffer = %.26s\n", list );      fclose( stream );   }   else      printf( "File could not be opened\n" );}

int main (void){	struct A { 		int number;		int count;	} a1[2], a2[2];	int s;		a1[0].number = 1;	a1[0].count = 12;	a1[1].number = 1;	a1[1].count = 12;	a2[0] = a1[0];	s = a1[0].count + a2[0].count;	return 0; }

struct student {	char fio[30];	int group;	float average;};struct student Init(char*, int, float);void Print(struct student*);int main(void){	struct student s1, s2, s3, *st;	int i;	s1 = Init("Ivanov I.", 3801, 5.00);	s2 = Init(s1.fio, 4209, 4.50);	s3 = Init("Petrov P", s1.group, s2.average);	st = &s3;	Print(st);	return 0;}struct student Init(char* n, int i, float f){	struct student s, *st;	st = &s;	strcpy(st->fio, n);	st->group = i;	st->average = f;	return s;}void Print(struct student *st){	printf("\nName: %s", st->fio);	printf("\nGrouproup: %d", st->group);	printf("\nAverage mark: %.2f\n", st->average);}

typedef struct sale_struct {	char *title;	int price;} sale;sale Copy(sale);int main(void){	sale s1,s2;	struct sale_struct s3, s4;	s1.title = "Book";	s1.price = 200;	s3.title = "Cake";	s3.price = 60;	return 0;}sale Copy(sale s) {	sale s1;	s1 = s;	return s1;}

	char t1 = 196;	int i = 0;	for (i=0; i<10; i++)		printf("%c", t1);

	int i = 0;	char str[10] = "Test";	while (str[i]!='\0')		i++;

	int m;	char month[3], s[8] = "";	char *season[] = {		"winter",		"spring",		"summer",		"autumn"	};	printf("Enter day of your birthday (MM.DD): ");	scanf("%[^.]s", month);	m = atoi(month);	if ((m==12) || (m<3)) strcpy(s, &season[0]);	else		if ((m>2) && (m<6)) strcpy(s, &season[1]);		else			if ((m>6) && (m<9)) strcpy(s, &season[2]);			else strcpy(s, &season[3]);	printf("Your birthday is in %s\n", s);

#include <stdio.h>#include <conio.h>#include <stdarg.h>#include <stdlib.h>#include <locale.h>void error(int severity, ... );int main(int argc, char* argv[]){	char err[][30] = {"Сообщение1", "Сообщение2"};	int n;		setlocale (LC_ALL, "rus");	n = argv[1];	switch (n) {		case 0: error(0, "Ошибка!", '\0');			break;		case 1: error(0, "Ошибка!", err[0], '\0');			break;		default: error(1, "Ошибка!", err[0], err[1], '\0');	}	return 0;}void error(int severity, ... ){   va_list ap;   va_start(ap, severity);   for (;;) {	   char *p = va_arg(ap, char*);	   if (p == '\0') break;	   printf("%s ", p);   }   va_end(ap);   printf("\n");}

	int a = 2*SCHAR_MAX;	int b = UCHAR_MAX;

	int n = 123, t;	void *p;	int *pn;	pn = &n;

			int n, m;	char *ptr; 	printf(&\nEnter a dimention of character array: &);	scanf_s(&%d&, &n);	_flushall();	ptr = (char *)malloc((n+1)*sizeof(char));	if (!ptr) {	printf(&\nERROR! Out of memmory (error in malloc() function). Press any key...&);	_getch(); 	exit(1); 	}	printf(&Enter a character array (not more than %d characters): &, n);	gets_s(ptr, n+1);	m = strlen(ptr);	printf(&\nStart line: %s&, ptr);	ptr = (char *)realloc(ptr, (m+2)*sizeof(char));	if (!ptr) {		printf(&\nERROR! Out of memmory (error in realloc() function). Press any key...&);		_getch();		exit(1);	}	strcat_s(ptr, m+2,  &!&);	printf(&\nStart line and character \&%c\&: %s&, '!', ptr);		free (ptr);

struct student {	char fio[30];	int group;	float average;};<Прототи функции Init>void Print(struct student*);int main(void){	struct student s, *st;	int i;	s = Init("Ivanov I.", 3801, 5.00);	st = &s;	Print(st);	return 0;}struct student Init(char* n, int i, float f){	struct student s, *st;	st = &s;	strcpy(st->fio, n);	st->group = i;	st->average = f;	return s;}void Print(struct student *st){	printf("\nName: %s", st->fio);	printf("\nGrouproup: %d", st->group);	printf("\nAverage mark: %.2f\n", st->average);}

char *xgets(char *s){  char ch, *p;  int t;  p = s;   for(t=0; t<80; ++t){    ch = getchar();    switch(ch) {      case '\n':        s[t] = '\0';         return p;      case '\b':        if(t>0) t--;        break;      default:        s[t] = ch;    }  }  s[79] = '\0';  return p;}

int main( void ){   FILE *stream;   char str[81];   int  result;   if ( fopen_s( &stream, "g:\\list.txt", "r+" ) != 0 )   {      printf( "The file list.txt was not opened\n" );      return -1;   }    result = fseek( stream, 0L, SEEK_END);   if( result )      perror( "Fseek failed" );   else   {      fputs( "5. NEC MultiSync EX231W - 10490 rub.", stream );      printf( "%s", str );    }   fclose( stream );   return 0;}

typedef struct {	char fio[30];	char phone[20];	int age;} note;note Init(char*, char*, int);void Print(note*);void Modify(note);int main(void){	note n[3], *pn;	char *strName[3] = {"Ivanov I.", "Pertov P.", "Sidorov S."};	char *strPhone[3] = {"12-34-56", "78-90-12", "34-56-78"};	int i, age = 25;	for (i=0; i<3; i++) {		n[i] = Init(strName[i], strPhone[i], age+i);		pn = &n[i];		Print(pn);	}	Modify(n[0]);	pn = &n[0];	Print(pn);	return 0;}note Init(char* f, char* p, int a){	note n, *pn;	pn = &n;	strcpy(pn->fio, f);	strcpy(pn->phone, p);	pn->age = a;	return n;}void Print(note *pn){	printf("\nName: %s", pn->fio);	printf("\nPhone: %s", pn->phone);	printf("\nAge: %d\n", pn->age);}void Modify(note n) {	strcpy(n.fio, "Vasiliev V.");	strcpy(n.phone, "89-01-23");	n.age = 30;}

#define N 8void step(int, int, int);	int map[N][N];	// карта: map[i,j]!=0, если точки i и j соединены	int road[N];	// маршрут - номера точек карты	int incl[N];	// incl[i]==1, если точка с номером i включена в road	int start;	// начальная точка маршрута 	int finish;	// конечная точка маршрута	int i, j;int main (void) {	// инициализация массивов	for (i=1; i<=N; i++) road[i] = 0;	for (i=1; i<=N; i++) incl[i] = 0;	for (i=1; i<=N; i++) 		for (j=1; j<=N; j++) map[i][j] = 0;	// ввод значений элементов карты	map[1][2] = 1; map[2][1] = 1; 	map[1][3] = 1; map[3][1] = 1;	map[1][4] = 1; map[4][1] = 1;	map[3][4] = 1; map[4][3] = 1;	map[3][7] = 1; map[7][3] = 1;	map[4][6] = 1; map[6][4] = 1;	map[5][6] = 1; map[6][5] = 1;	map[5][7] = 1; map[7][5] = 1;	map[6][7] = 1; map[7][6] = 1;	printf("Введите через пробел номер начальной и конечной точек: ");	scanf("%d %d", &start, &finish);	road[1] = start;	// внести точку в маршрут	incl[1] = 1;		// пометить точку как включенную	step(start, finish, 2);	return 0;}void step(int s, int f, int p) {	int c;				// номер точки, в которую делается очередной шаг	int i;		if (s==f) {		printf("Путь: ");		for (i=1; i<=p-1; i++) printf("%d ", road[i]);		printf("\n");	}	else {		// выбор очередной точки		for (c=1; c<=N; c++)			// проверка всех вершин			if (map[s][c]!=0 && incl[c]==0) {				// точка соединена с текущей и не включена в маршрут				<Рекурсивный вызов - вариант 1>				road[p] = c;		// добавление вершины в путь				incl[c] = 1;		// пометка вершины как включенной				<Рекурсивный вызов - вариант 2>				incl[c] = 0;				road[p] = 0;				<Рекурсивный вызов - вариант 3>			}	}}

int main (void) {	double (*pFunc) (double);	int c = 1;	double y;	while(1) {		printf("Выберите функцию (0-выход): 1-sqrt, 2-sin, 3-tan\n");		scanf("%d", &c);		switch(c) {			case 1: pFunc = sqrt; break;			case 2: pFunc = sin; break;			case 3: pFunc = tan; break;			case 0: return;			default: continue;		}			y = pFunc(1.1);		printf("f(1.1) = %.2f\n", y);	}			return 0;}

int main(void){	union pw {	  int i;	  double d;	  char ch[2];	} pw = {"y"};		printf("pw.i = %d", pw.i);		return 0;}