Swap Two Numbers using Macro

Write a macro that Swaps two numbers. WAP to use it.

#include<iostream>

#define swap(x,y) { x=x+y; y=x-y; x=x-y; }

using namespace std;

void main()

{

int x,y;

system("cls");

cout<<"\n Enter any two numbers : ";

cin>>x>>y;

cout<<"\n\n Before swapping\n x= "<<x<<"\n y= "<<y;

swap(x,y);

cout<<"\n\n After swapping\n x= "<<x<<"\n y= "<<y<<"\n\n";

system("pause");

}