C/C++ Program to swap to integers without temp variable

//Program to swap to integers without temp variable
#include<iostream>
using namespace std;
int main()
{
    int a,b;
    cout<<"\n enter A:";
    cin>>a;
    cout<<"\n enter B:";
    cin>>b;
    cout<<"\n Before swapping";
    cout<<"\n A:"<<a<<"\t B:"<<b;
    a=a+b;
    b=a-b;
    a=a-b;
    cout<<"\n After swapping";
    cout<<"\n A:"<<a<<"\t B:"<<b<<endl;
return 0;
}