I have started trying to learn c#.

I don’t understand why my use of Array.IndexOf(); returns -1.
I want it to return the index numbers in the alphabet based on the letters in a player_name that you get from user input. I am trying to loop through the characters of the
player_name and capture the index number of that character in the alphabet.

Take a look:

using System;

namespace FantasyGame
{
    internal class Program
    {
        static void Main(string[] args)
        {
            string player_name = null;

            string[] alphabet = { "a", "b", "c", "d", "e", "f", "g", "h", "i", "j", "k", "l", "m", "n", "o", "p", "q", "r", "s", "t", "u", "v", "w", "x", "y", "z", "æ", "ø", "å", "a", "b", "c", "d", "e", "f", "g", "h", "i", "j", "k", "l", "m", "n", "o", "p", "q", "r", "s", "t", "u", "v", "w", "x", "y", "z", "æ", "ø", "å" };

            Console.Write("\nEnter your name: ");
            player_name = Console.ReadLine();


            string[] password = { };
            foreach (char c in player_name)
            {
                int index = Array.IndexOf(alphabet, c);
                Console.WriteLine(Array.IndexOf(alphabet, c));
                Console.WriteLine(c);

            }
        }
    }
}

If I replace the c variable with a specific string value such as "k" it returns the correct index number. Why? The ´´´c´´´ has a string value, right?

>Solution :

The c has a string value, right?

No, it has a char value. You can see that where you’ve declared the variable:

foreach (char c in player_name)

There are numerous fixes for this. I’d suggest the simplest is to just make alphabet a string and use string.IndexOf. Alternatively, to keep your code as similar as possible, make alphabet a char[], e.g. by using String.ToCharArray:

char[] alphabet = "abcdefghijklmnopqrstuvwxyzæøåabcdefghijklmnopqrstuvwxyzæøå".ToCharArray();