Check a String is Palindrome

Introduction

This tip covers how we can check a string is palindrome or not.

Background

Now a day you can expect a question in every Interviews that to write a program to check whether a String is palindrome or not. I thought of sharing my methods two find out the same :)

Using the Code

We can do it in two ways:

1. By creating char arrays
   
   
2. By using string reverse method
   
   NB: There are some other methods also, for now I am sharing these two.

By creating char arrays

private static bool chkPallindrome(string strVal)
{
     try
     {
          int min = 0;
          int max = strVal.Length - 1;
          while (true)
          {
               if (min > max)
               return true;
               char minChar = strVal[min];
               char maxChar = strVal[max];
               if (char.ToLower(minChar) != char.ToLower(maxChar))
               {
                    return false;
               }
               min++;
               max--;
         }
     }
     catch (Exception)
     {
          throw;
     }
}
By using string reverse method
private static void CheckAndDisplay(string strReal)
{
     string strRev;
     char[] tmpChar = strReal.ToCharArray();
     Array.Reverse(tmpChar);
     strRev = new string(tmpChar);
     if (strReal.Equals(strRev, StringComparison.OrdinalIgnoreCase))
     {
          Console.WriteLine("The string is pallindrome");
     }
     else
     {
           Console.WriteLine("The string is not pallindrome");
     }
     Console.ReadLine();
}

Please download to see the entire program. I hope it helps someone.

Output



Points of Interest

 

• Palindrome, Arrays, Array Manipulations

History

• 1st version: 16-11-2014

Thank you for reading.