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

int main()
{
	int x = 15, y = 25;
	cout << "The numbers x and y are: "
	     << x << " and " << y << " respectively." << endl;
	     
	swap (x, y);
	cout << "The numbers x and y are: "
	     << x << " and " << y << " respectively." << endl;

	return 0;
}