Swapping in C++

[Saba]

Write C++ code to replace two variables A and B with each other.
Given A=2, B=1, you need to swap the values of A and B without using any third variable.


Hints
Assign the value stored in A to the variable B and the value stored in B to the variable A without using any third variable.

[Banfa]

What a useless hint, it is exactly the same as the actual question.

A better hint is that the best solution (I have seen) uses the xor operator ^

consider what A ^ B ^ B is

[vermarajeev]

int main(int argc, char** argv[])
{
    int a,b;
    cout<<"Enter two numbers"<<endl;
    cin>>a>>b;
 
    cout<<"Before swapping"<<endl;
    cout<<"a:"<<a<<"\t"<<"b:"<<b<<endl;
 
    //solution1
    a = a^b;
    b = b^a;
    a = a^b;
 
    //solution2
    /*a = a+b;
    b = a-b;
    a = a-b;*/
 
    cout<<"After swapping"<<endl;
    cout<<"a:"<<a<<"\t"<<"b:"<<b<<endl;
 
    return 0;
}