C++ Program to swap two numbers without using third variable

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In this program, You will learn how to swap two numbers without using third variable in C++.

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num1 = num1 + num2

num2 = num1 - num2

num1 = num1 - num2

Example: How to swap two numbers without using third variable in C++.

#include<iostream>
using namespace std;

int main() {

    int num1, num2;
    cout << "Enter two numbers:";
    cin >> num1 >> num2;

    num1 = num1 + num2;
    num2 = num1 - num2;
    num1 = num1 - num2;

    cout << "After swapping :";

    cout << "\nNum1 is :" << num1;
    cout << "\nNum2 is :" << num2;

    return 0;
}

Output:

Enter two numbers:10 20
After swapping :
Num1 is :20
Num2 is :10