#include <stdio.h>

int sum (int, int);

int
main (void)
{
int total;

total = sum (2, 3);
printf ("Total is %d\n", total);

return 0;
}

int
sum (int a, int b)
{
return a + b;
}
there's no error in this program but still not seeing output just a blank screen flashes.....