Материал из C\C++ эксперт
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
int main(void)
{
char command[80], temp[80];
int i, j;
for( ; ; ) {
printf("Operation: add, subtract, divide and multiply? \n");
printf("Enter the whole word \n");
gets(command);
/* if user wants to stop */
if(!strcmp(command, "quit"))
break;
printf("Enter the first number: ");
gets(temp);
i = atoi(temp);
printf("Enter the second number: ");
gets(temp);
j = atoi(temp);
/* now, perform the operation */
if(!strcmp(command, "add"))
printf("%d\n", i + j);
else if(!strcmp(command, "subtract"))
printf("%d\n", i - j);
else if(!strcmp(command, "divide")) {
if(j)/* non - zero*/
printf("%d\n", i / j);
}
else if(!strcmp(command, "multiply"))
printf("%d\n", i * j);
else
printf("Unknown command. \n");
}
return 0;
}
