Swap two numbers without third variable

Q. Write a C++ program to swap two numbers without using third variable.

Answer:

Following program shows that swapping of two numbers without using third variable.

#include<iostream>
using namespace std;
int main()
{
        int a,b;

        cout<<"\n Enter Two Numbers : \n";
        cin>>a>>b;

        cout<<"\n Before Swapping : \n";
        cout<<a<<"\n"<<b<<"\n";

        a=a+b;
        b=a-b;
        a=a-b;

        cout<<"\n After Swapping : \n";
        cout<<a<<"\n"<<b;

        return 0;
}


Output:

swaping without third variable
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