C#: Program to swap two numbers

Last update on June 23 2025 12:59:26 (UTC/GMT +8 hours)

Swap Two Numbers

Write a C# Sharp program to swap two numbers.

C# Sharp: swapping two variables

The act of swapping two variables refers to mutually exchanging the values of the variables. Generall, this is done with the data in memory.

Using a temporary variable :

The simplest method to swap two variables is to use a third temporary variable :

define swap(x, y)
    temp := x
    x := y
    y := temp

Sample Solution:

C# Sharp Code:

using System;

// This is the beginning of the Exercise5 class
public class Exercise5
{
    // This is the main method where the program execution starts
    public static void Main(string[] args)
    {
        // Declaration of variables to store numbers and temporary value for swapping
        int number1, number2, temp;

        // Prompting the user to input the first number
        Console.Write("\nInput the First Number : ");
        // Reading the first number entered by the user and converting it to an integer
        number1 = int.Parse(Console.ReadLine());

        // Prompting the user to input the second number
        Console.Write("\nInput the Second Number : ");
        // Reading the second number entered by the user and converting it to an integer
        number2 = int.Parse(Console.ReadLine());

        // Swapping the values of number1 and number2 using a temporary variable
        temp = number1;
        number1 = number2;
        number2 = temp;

        // Displaying the result after swapping
        Console.Write("\nAfter Swapping : ");
        Console.Write("\nFirst Number : " + number1); // Displaying the first number after swapping
        Console.Write("\nSecond Number : " + number2); // Displaying the second number after swapping

        Console.Read(); // Keeping the console window open until a key is pressed
    }
}

Sample Output:

Input the First Number : 2    
Input the Second Number : 5    
After Swapping :                                                                                              
First Number : 5                                                                                              
Second Number : 2

Flowchart:

For more Practice: Solve these Related Problems:

Write a C# program to swap three numbers in a circular way without using any additional variables.
Write a C# program to swap two numbers using XOR bitwise operations only.
Write a C# program to swap two decimal values and round them to the nearest integer before and after swapping.
Write a C# program to swap two user-entered values and then revert them back to original values in one flow.

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