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

int main()

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

 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");
   }

 printf("Would you like to calculate another number? Please enter 1-yes or 0-no: \n");
 scanf( "%d", &answer );
 if (answer = 1, loop = 1);
 if (answer = 0, loop = 0);
 }
   getchar();
   return 0;
}