#include <stdio.h>
#include <string.h>

int num1;
int num2;
int result;
int answer;
int loop = 1;
char string1[4] = "sum";
char string2[4] = "sub";
char string3[5] = "mult";
char string4[4] = "div";
char operation[5];

int main()

{

 while (loop == 1)

 {
      printf( "Please enter a number you wish to be calculated: " );
      scanf( "%d", &num1 );

      printf ("Please enter another number for the calculation: " );
      scanf( "%d", &num2 );

      printf( "Enter either sum, sub, mult or div to see a result: ");
      scanf( "%s", operation );

      if (strcmp(operation, string1) == 0)
      {
      result = num1 + num2;
      printf( "The sum of your numbers is: %d \n", result);
      }

      else if (strcmp(operation, string2) == 0)
      {
      result = num1 - num2;
      printf("The subtraction of your numbers is: %d \n", result);
      }

      else if (strcmp(operation, string3) == 0)
      {
      result = num1 * num2;
      printf("The multiplication of your numbers is: %d \n", result);
      }

      else if (strcmp(operation, string4) == 0)
      {
      result = num1 / num2;
      printf("The division of your numbers is: %d \n", result);
      }

      else
      {
      printf("You didnt enter a correct keyword! \n");
      }

      getchar();
      getchar();

   printf("Another number? Please enter 1-yes or 0-no: \n");
   scanf( "%d", &answer );
   if (answer ==1)
   loop = 1;
   else
   loop = 0;

   getchar();
 }

   return 0;

}