Program to swap two numbers by using three variables

//// swap 2 numbers ////

#include "stdafx.h"

#include "stdio.h"

#include "conio.h"

#include "iostream"

using namespace std;

int _tmain(int argc, _TCHAR* argv[])

{

       int a=0;

       int b=0;

       int swap=0;

       cout<<"enter a";

       cin>>a;

       cout<<"b";

       cin>>b;

       swap=a;

       a=b;

       b=swap;

       cout<<"a="<<a<<"\n";

       cout<<"b="<<b<<"\n";

       getch();

}