#include <stdio.h>

void swap_int(int *x, int *y)
{
	int tmp;

	tmp = *x;
	*x = *y;
	*y = tmp;
}

int main(void)
{
	int a, b;

	a = 2;
	b = 3;

	swap_int(&a, &b);
	printf("%d %d\n", a, b);

	return 0;
}