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palindrome in c#

In this program, You will learn how to check whether number is palindrome or not in C#, using a while loop, or for loop.

A number is a palindrome if the reversed number is equal to the original number. For example 121, 101, 12321 are palindrome numbers.

palindrome program in c# using for loop

using System;
class Palindrome {
  public static void Main() {
      int r,n,rev=0,copy;
      Console.Write("Enter the number:");
      n=int.Parse(Console.ReadLine());
      copy=n;
      for(;n>0;n=n/10)
      { 
        // It will find the reverse of the input entered by the user.
        rev=rev*10+n%10;
      }
      // Compare the reverse of input with the temporary variable
      if(copy==rev)
        Console.Write(copy+" is a palindrome number");
      else
        Console.Write(copy+" is a not palindrome number");
    }
}

palindrome program in c# using while loop

using System;
class Palindrome {
  public static void Main() {
      int r,n,rev=0,copy;
      Console.Write("Enter the number:");
      n=int.Parse(Console.ReadLine());
      copy=n;
      while(n>0)
      { 
        // It will find the reverse of the input entered by the user.
        rev=rev*10+n%10;
        n=n/10;
      }
      // Compare the reverse of input with the temporary variable
      if(copy==rev)
        Console.Write(copy+" is a palindrome number");
      else
        Console.Write(copy+" is a not palindrome number");
    }
}

output

Enter the number:121
121 is a palindrome number

Enter the number:123
123 is a not palindrome number

working of palindrome number in C#

In the above program, asked the user to enter a positive number which is store in the variable n
The number is saved into another variable copy to check it when we need to compare our original number with reverse number
Inside the loop, one by one last digit number is separated using code n%10 and rev*10 will maintain their n^th position
After reversing the digits, compare a reverse value with the original value which is store in the copy variable
If the numbers are equal, then the number is a palindrome, otherwise, it's not.

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