C# Program to check for valid values

Question

I need some help to remove duplicate values from the following program. I cannot use Hashset, list or anything except Arrays. I have looked at different solutions that i can

Answer 1

I think this should work for you.

static void Main()
    {
        char[] array = new char[5];
        Console.WriteLine("Please Enter 5 Letters B/W a through j only: ");
        string letters = "abcdefghij";

        int counter = 0;
        while (counter < 5)
        {
            string input = Console.ReadLine().ToLower();
            char myChar = input[0];

            if (input.Length != 1 || array.Contains(myChar) || !letters.Contains(myChar))
            {
                Console.WriteLine("You have entered an incorrect value");
                continue;
            }

            array[counter++] = myChar;
        }

        Console.WriteLine("You have Entered the following Inputs: ");
        Console.WriteLine(string.Join(", ", array));
    }