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Console menu: calculation

  
#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;
}

           
       

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