#include <stdio.h>

void swap(int a, int b)
{
	int t = a;
	a = b;
	b = t;
}

int main()
{
	int x = 3, y = 4;
	printf("x = %d, y = %d\n", x, y);

	swap(x, y);

	printf("x = %d, y = %d\n", x, y);
}