#include <stdio.h>
#include <stdlib.h>

// use the sum function defined in sumfunction.c
int sum(int a, int b);

int main(int argc, char* argv[])
{
    // initialize variables to sum
    int a = 1;
    int b = 2;
    
    if (argc >= 2)
        a = strtol(argv[1], NULL, 10);
    if (argc >= 3)
        b = strtol(argv[2], NULL, 10);
    
    // print out the results of the sum function
    printf("%d + %d = %d\n", a, b, sum(a, b));
}