C#: Check whether a string is Palindrome or not

Last update on December 20 2024 12:52:24 (UTC/GMT +8 hours)

Write a program in C# Sharp to check whether a given string is a palindrome or not using recursion.

Visual Presentation:

Sample Solution:

C# Sharp Code:

using System;

public class RecExercise8
{
    // Method to check if a string is a palindrome using recursion
    public static bool IsPalindrome(string text)
    {
        // Base case: If the length of the text is 0 or 1, it's a palindrome
        if (text.Length <= 1)
            return true;
        else
        {
            // Check if the first and last characters are equal
            if (text[0] != text[text.Length - 1])
                return false; // If not equal, it's not a palindrome
            else
                // Recursive call: Check the substring without the first and last characters
                return IsPalindrome(text.Substring(1, text.Length - 2));
        }
    }

    public static void Main()
    {
        Console.Write("\n\n Recursion : Check whether a string is a Palindrome or not :\n");
        Console.Write("---------------------------------------------------------------\n");

        string str1;
        bool tf;

        Console.Write(" Input a string : ");
        str1 = Console.ReadLine();

        // Call IsPalindrome function and get the result
        tf = IsPalindrome(str1);

        // Output whether the input string is a palindrome or not
        if (tf == true)
        {
            Console.WriteLine(" The string is a Palindrome.\n");
        }
        else
        {
            Console.WriteLine(" The string is not a Palindrome.\n");
        }
    }
}

Sample Output:

Recursion : Check whether a string ia Palindrome or not :                                                    
---------------------------------------------------------------                                               
 Input a string : eye                                                                                         
 The string is Palindrome.

Flowchart :

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