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Check If a String is a Palindrome in C#

In this C# program, the objective is to write an iterative function that checks if a given string is a palindrome (symmetric). A palindrome is a word, phrase, or sequence that reads the same backward as forward. For example, the word "RADAR" is a palindrome because it remains the same when reversed. The program will check if a string meets this condition and return a boolean result.



Group

Functions in C#

Objective

1. Implement an iterative function to check if a string is symmetric (a palindrome).
2. Use two pointers, one starting at the beginning of the string and the other at the end.
3. Compare the characters at the two pointers and move towards the center.
4. If any pair of characters does not match, return false.
5. If the entire string is checked and the characters match, return true.

Write an C# iterative function to say whether a string is symmetric (a palindrome). For example, "RADAR" is a palindrome.

Example C# Exercise

 Copy C# Code 
using System;

class Program
{
    // Function to check if a string is a palindrome iteratively
    static bool IsPalindrome(string str)
    {
        int left = 0; // Pointer at the beginning of the string
        int right = str.Length - 1; // Pointer at the end of the string

        // Loop through the string until the pointers meet in the middle
        while (left < right)
        {
            // Compare characters at the left and right pointers
            if (str[left] != str[right])
            {
                return false; // Return false if characters don't match
            }

            left++; // Move the left pointer towards the center
            right--; // Move the right pointer towards the center
        }

        return true; // Return true if the string is a palindrome
    }

    static void Main()
    {
        // Test the IsPalindrome function with the string "RADAR"
        string testString = "RADAR";
        if (IsPalindrome(testString))
        {
            Console.WriteLine($"{testString} is a palindrome.");
        }
        else
        {
            Console.WriteLine($"{testString} is not a palindrome.");
        }

        // Test the IsPalindrome function with a string that is not a palindrome
        testString = "HELLO";
        if (IsPalindrome(testString))
        {
            Console.WriteLine($"{testString} is a palindrome.");
        }
        else
        {
            Console.WriteLine($"{testString} is not a palindrome.");
        }
    }
}

 Output

RADAR is a palindrome.
HELLO is not a palindrome.

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