#include <iostream>
using namespace std;

// swap the values stores at a and b
void Swap (int * a, int * b);

void Swap (int & a, int & b);

int main()
{
	int x=100;
	int y=200;

	cout <<"address of x : " << &x << endl;
	cout <<"address of y : " << &y << endl << endl;

	cout <<"Before Swap: x=" << x <<"; y=" << y << endl;
	Swap (&x, &y);
	cout <<"After Swap: x=" << x <<"; y=" << y << endl;

	cout <<endl;
	Swap (x,y);
	cout <<"After Second Swap: x=" << x <<"; y=" << y << endl;
}

void Swap (int * a, int * b)
{
	int tmp;

	cout <<"a = " << a << endl;
	cout <<"b = " << b << endl;

	tmp = *a;
	*a = *b;
	*b = tmp;
}


void Swap (int & a, int & b)
{
	int tmp;

	cout <<"a = " << a << endl;
	cout <<"b = " << b << endl;

	tmp = a;
	a = b;
	b = tmp;
}