/* global variables */

#include<stdio.h>

int the_answer;  /* this is a global variable */

void summ_it(int var1, int var2);  /* function prototype */

int main()
{

	int a, b, c;

	a = 5;
	b = 7;

	summ_it(a, b);

	printf("%d plus %d equals %d\n", a, b, the_answer);
}

void summ_it(int var1, int var2)
{

	the_answer = var1 + var2;

}