Write a program to swap two variables without third variable.

C++ Code

#include<iostream>
#include<conio.h>
using namespace std;
int main()
{
int a,b;
cout<<"a=";
cin>>a;
cout<<"b=";
cin>>b;
a=a+b;
b=a-b;
a=a-b;
cout<<"a="<<a<<endl<<"b="<<b;
getch();
}