C# Examples

C# Program - Check whether a Number is Palindrome or not

A number is known as a Palindrome number if the reverse of the number is same as the number. For example, 121 is a palindrome number, but 123 is not a palindrome number.

Example: Check Palindrome Number

In the example below, the number called MyNum is checked for palindrome number. The MyNum is first stored in a variable called Num. A while loop is used on this variable to perform following operations:

  • last digit of the Num variable is estimated using Num % 10 and stored in digit variable.
  • reverse number is built using revNum * 10 + digit.
  • last digit is removed from Num variable using Num / 10.

Finally, MyNum is compared with revNum to check whether the number is palindrome or not.

using System;

class MyProgram {
  static void Palindrome(int MyNum) {
    int revNum = 0;
    int Num = MyNum;

    while(Num > 0){
      int digit = Num % 10;
      revNum = revNum * 10 + digit;
      Num = Num / 10;

    if (MyNum == revNum){
      Console.WriteLine(MyNum + " is a Palindrome number.");
    } else {
      Console.WriteLine(MyNum + " is not a Palindrome number.");

  static void Main(String[] args) {

The above code will give the following output:

12521 is a Palindrome number.
9779 is a Palindrome number.
1000 is not a Palindrome number.