#include <stdio.h>
void swap (int a, int b)
{
	int temp;
	temp=a;
	a=b;
	b=temp;
}

int main()
{
	int x,y;
	x=10; y=15;
	printf("x=%d y=%d \n",x,y);
	swap(x,y);
	printf("x=%d y=%d \n",x,y);
}