C++ Programs to Swap two numbers

In this tutorial you will learn about the C++ Programs to Swap two numbers and its application with practical example.

In this tutorial, we will learn to create a C++ program that will Swap two numbers in C++ programming.

Table Of Contents−

C++ Programs to Swap two numbers

Prerequisites

Before starting with this tutorial we assume that you are best aware of the following C++ programming topics:

Operators in C++ Programming.

Basic Input and Output function in C++ Programming.
Basic C++ programming.

Swapping of Numbers:-

In swapping we swap the data of two variables. In this program, we will use the third variable to swap the data of the first and second variables.

Let us understand with an example.

a = 100, b = 200

After line 1: flag = a
flag = 100

After line 2: a = b
a = 200

After line 3 : b = flag
b = 100

a = 100, b = 200

After line 1: flag = a

flag = 100

After line 2: a = b

a = 200

After line 3 : b = flag

b = 100

Algorithm for the program:-

1. Declare the variables for the program.

2. Taking the input numbers from the user.

3. Swapping that number using third variable.  

4. Print the Result.

5. End the program.

1. Declare the variables for the program.

2. Taking the input numbers from the user.

3. Swapping that number using third variable.

4. Print the Result.

5. End the program.

In every programming language, numbers play a very important role in a programming language. As we all know the c++ is a very powerful language. With the help of the c++ programming language, we can make many programs. We can perform many input-output operations using c++ programming. In today’s tutorial, we take the input numbers from the user. Then we will swap two Numbers with the help of the third variable in the c++ programming language.

With the help of this program, we can Swap two numbers.

Program to swap two Numbers:-

#include <iostream>
using namespace std;

int main()
{
    //declaring the variables for the program for the program
    int first = 5; //first integer value for the program
    int second = 6; //second integer value for the program
    int flag; //temporary variable for the program
    
    //printing the numbers before the swapping
    cout << "Before swapping." << endl;
    cout << "a = " << first << ", b = " << second << endl;
    
    //Swapping the numbers
    flag = first;
    first = second;
    second = flag;
    
    //printing after swapping
    cout << "\nAfter swapping." << endl;
    cout << "a = " << first << ", b = " << second << endl;

    return 0;
}

#include <iostream>

using namespace std;

int main()

{

//declaring the variables for the program for the program

int first = 5; //first integer value for the program

int second = 6; //second integer value for the program

int flag; //temporary variable for the program

//printing the numbers before the swapping

cout << "Before swapping." << endl;

cout << "a = " << first << ", b = " << second << endl;

//Swapping the numbers

flag = first;

first = second;

second = flag;

//printing after swapping

cout << "\nAfter swapping." << endl;

cout << "a = " << first << ", b = " << second << endl;

return 0;

}

Output:-

In the above program, we have first initialized the required variable.

first= it will hold the integer value.
second = it will hold the integer value.

flag = it will hold the integer value.

Printing the numbers before the swapping of values.

Swapping the numbers using a third variable with simple logic.

Printing the output swapped numbers from the program.

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C++ Programs to Swap two numbers

Prerequisites

Swapping of Numbers:-

Algorithm for the program:-