Function Palindrome, iterative

// Import the System namespace to use basic classes like Console
using System;

class Program
{
    // Function to check if a string is a palindrome (symmetric)
    public static bool Palindrome(string str)
    {
        // Convert the string to uppercase to make the comparison case-insensitive
        str = str.ToUpper();

        // Loop through half of the string and compare each character from both ends
        for (int i = 0; i < str.Length / 2; i++)
        {
            // Compare the character at position i with the character at the corresponding position from the end
            if (str[i] != str[str.Length - i - 1])
            {
                // If any character does not match, it's not a palindrome
                return false;
            }
        }

        // If all characters match, it's a palindrome
        return true;
    }

    // Main function to test the Palindrome function
    public static void Main()
    {
        // Test case 1: "RADAR"
        string testString1 = "RADAR";
        Console.WriteLine($"Is \"{testString1}\" a palindrome? {Palindrome(testString1)}");

        // Test case 2: "HELLO"
        string testString2 = "HELLO";
        Console.WriteLine($"Is \"{testString2}\" a palindrome? {Palindrome(testString2)}");

        // Test case 3: "madam"
        string testString3 = "madam";
        Console.WriteLine($"Is \"{testString3}\" a palindrome? {Palindrome(testString3)}");
    }
}

 Output

Is "RADAR" a palindrome? True
Is "HELLO" a palindrome? False
Is "madam" a palindrome? True