Swap Two Numbers Without Third Variable in C++

Last Updated : 14 Feb, 2024

In C++, swapping two numbers means we need to exchange the value of two numbers. In this article, we will learn how to swap two numbers without using the third variable in C++.

Example

Input: 
a=10
b=20Output:
After swapping:
a=20
b=10

Swap Two Numbers Without Using a Third Variable

In C++ we can swap two numbers without using a temporary variable by using simple addition and subtraction arithmetic trick as shown.

C++ Program to Swap Two Numbers Without Using Temporary Variable

The below program shows how we can swap two numbers without using a temporary variable.

C++

// C++ program to swap two numbers without using temporary // variable  #include <iostream> using namespace std;  int main() {     // numbers to be swapped     int a = 5, b = 10;     int x = 50, y = 100;      cout << "Before swapping: x = " << x << ", y = " << y          << endl;      // performing swap using addition substraction method     x = x + y;     y = x - y;     x = x - y;     // print values after swapping     cout << "After swapping: x = " << x << ", y = " << y          << endl          << endl;      return 0; }

Output

Before swapping: x = 50, y = 100  After swapping: x = 100, y = 50

Time Complexity: O(1)
Auxiliary Space: O(1)

Swap Two Numbers Without Third Variable in C++

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Swap Two Numbers Without Third Variable in C++

Swap Two Numbers Without Using a Third Variable

C++ Program to Swap Two Numbers Without Using Temporary Variable

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