#include <stdio.h>
int main (int argc, const char * argv[]) {
   int loop = 7;
   while (loop == 7) {
      
   int a, b, count, answer;
   char op;
   
   //print prompt
   printf("Enter an expression: ");
   
   //get expression
   count = scanf("%d %c %d", &a, &op, &b);
   if (count !=3) {
      printf("Bad expression!\n");
      break;
   }else{
   
   //calculate
   answer = calculate(a, b, op);
   printf("%d %c %d = %d\n", a, op, b, answer);
   }
}
   return 0;
}
C Code