/* passing arguments by value */

#include<stdio.h>

int summ_it(int var1, int var2);

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);
}

int summ_it(int var1, int var2)
{
	int answer;

	answer = var1 + var2;

	printf("inside the function, var1 is %d, and var2 is %d\n", var1, var2);

	var1 = var1 + 20;
	var2 = var2 + 20;

	printf("still inside the function, we've changed this to\n");
	printf("var1 = %d, var2 = %d\n", var1, var2);

	return answer;
}