C#: Check whether a number is a palindrome or not

Last update on August 21 2025 12:55:27 (UTC/GMT +8 hours)

Write a program in C# Sharp to check whether a number is a palindrome or not.

Visual Presentation:

C# Sharp Exercises: Check whether a number is a palindrome or not

Sample Solution:

C# Sharp Code:

using System;  // Importing necessary namespace

public class Exercise38  // Declaration of the Exercise38 class
{  
    public static void Main()  // Main method, entry point of the program
    {
        int num, r, sum = 0, t;  // Declaration of variables

        Console.Write("\n\n");  // Displaying new lines
        Console.Write("Check whether a number is a palindrome or not:\n");  // Displaying the purpose of the program
        Console.Write("------------------------------------------------\n\n");  // Displaying a separator and new lines

        Console.Write("Input a number: ");  // Prompting the user to input a number
        num = Convert.ToInt32(Console.ReadLine());  // Reading the number entered by the user

        t = num;  // Storing the original number

        for (; num != 0; num = num / 10)  // Loop to reverse the number
        {
            r = num % 10;  // Extracting the last digit of the number
            sum = sum * 10 + r;  // Reversing the number by storing each digit sequentially
        }

        if (t == sum)  // Checking if the original number is equal to its reverse
            Console.Write("{0} is a palindrome number.\n", t);  // Displaying the result if the number is a palindrome
        else
            Console.Write("{0} is not a palindrome number.\n", t);  // Displaying the result if the number is not a palindrome
    }	
}

Sample Output:

Check whether a number is a palindrome or not:                                                              
------------------------------------------------                                                            
Input a number: 8                                                                                           
8 is a palindrome number.

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