/* an example of a function in C */

#include<stdio.h>

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

/* main function */
int main()
{

	int a, b, c;

	a = 5;
	b = 7;

	c = summ_it(a, b);

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

/* function definition (body) */
int summ_it(int var1, int var2)
{
	int answer;

	answer = var1 + var2;

	return answer;
}