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


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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 is not a palindrome number.

Example: Check Palindrome Number

In the below example, 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;

namespace MyApplication { 
   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) {
      Palindrome(12521);
      Palindrome(9779);
      Palindrome(1000);
    }
  }
}

Output

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



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