C#•16mo ago

❔ Palindrome

So I tried to solve this problem, and I know I've done it right.. but I must be tripping because a char array which has the same value as another char array, returns false when I try to do the .Equals method

4 Replies

KalamOP•16mo ago

C#
C#
public static void Main(string[] args)
    {
        Console.WriteLine(IsPalindrome(121));
    }
    private static bool IsPalindrome(int x)
    {
        var input = (x + "").ToCharArray();
        return input.Equals(Reverse(input));
    }
    
    private static char[] Reverse(char[] input)
    {
        char[] output = new char[input.Length];
        int index = 0;
        for (int i = input.Length - 1; i >= 0; i--)
        {
            output[index] = input[i];
            index++;
        }
        return output;
    }

C#
C#
public static void Main(string[] args)
    {
        Console.WriteLine(IsPalindrome(121));
    }
    private static bool IsPalindrome(int x)
    {
        var input = (x + "").ToCharArray();
        return input.Equals(Reverse(input));
    }
    
    private static char[] Reverse(char[] input)
    {
        char[] output = new char[input.Length];
        int index = 0;
        for (int i = input.Length - 1; i >= 0; i--)
        {
            output[index] = input[i];
            index++;
        }
        return output;
    }

:') I see should I use == instead? then convert em to string? me thinking it'd be the same as java :') ayt ty, I'll try the loop thing oh true i'll try that yeah, I appreciate the help :) I like efficient methods, n yours seems to be better so I'll try it out

KalamOP•16mo ago

hehe works thank you

Servator•16mo ago

why not Range operator ? :/

    public static bool IsPalindrome(this string text)
    {
        for (var i = 0; i < text.Length; i++)
        {
            if (text[i] != text[^(text.Length - i)])
            {
                return false;
            }
        }

        return true;
    }

    public static bool IsPalindrome(this string text)
    {
        for (var i = 0; i < text.Length; i++)
        {
            if (text[i] != text[^(text.Length - i)])
            {
                return false;
            }
        }

        return true;
    }

which is

public static bool IsPalindrome(this string text) => !text.Where((t, i) => t != text[^(text.Length - i)]).Any();

public static bool IsPalindrome(this string text) => !text.Where((t, i) => t != text[^(text.Length - i)]).Any();

oh mb it should be i+1 like you said 😄 Aren't we comparing 2 indexes ? ¯\_(ツ)_/¯

Accord•16mo ago

Was this issue resolved? If so, run /close - otherwise I will mark this as stale and this post will be archived until there is new activity.

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Programming

❔ Palindrome