C++ swap

Introduction

Swap is a common programming task. It is used to exchange the values of two variables.
In C++, you can swap two variables using a temporary variable or without using a temporary variable.
In this tutorial, we will learn how to swap two variables using both methods.

Code - Swap with temporary variable

Example:

int x = 10;
int y = 20;
int temp;

				// Before swapping, x = 10, y = 20
temp = x;			// x = 10, y = 20, temp = 10
x = y;				// x = 20, y = 20, temp = 10
y = temp;			// x = 20, y = 10, temp = 10

After the code is executed, x will be 20 and y will be 10.

Code - Swap without temporary variable

Example:

int x = 10;
int y = 20;

				// Before swapping, x = 10, y = 20
x = x + y;			// x = 30, y = 20
y = x - y;			// x = 30, y = 10
x = x - y;			// x = 20, y = 10