1#include <stdio.h>
 2#include "calc.h"
 3
 4int main(void)
 5{
 6    printf("6 + 3 = %d\n", add(6, 3));
 7    printf("6 - 3 = %d\n", subtract(6, 3));
 8    printf("6 * 3 = %d\n", multiply(6, 3));
 9    printf("6 / 3 = %d\n", divide(6, 3));
10    return 0;
11}