#include<stdio.h>

void swap(int,int);

int main(int argc, char **argv)
{
	int x,y;

	x = 5; y = 9;
	printf("x = %d, y = %d\n",x,y);
	swap(x,y);
	printf("x = %d, y = %d\n",x,y);
}

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

	t = a;
	a = b;
	b = t;
}