C# Need inputs in different lines

Question

I am trying to create a program that is will take letters as input only and not duplicated. I am getting error when i put one letter in an input. This is what i need to do,

Answer 1

If you want the user to enter the values individually then you would need to request each character in a loop. Something like:

static void Main(string[] args)
{
    const string validValues = "abcdefghij";
    var enteredCharacters = new char[5];
    for (int i = 0; i < enteredCharacters.Length; i++)
    {
        Console.WriteLine("Please enter a unique character between a and j");
        var input = Console.ReadLine();
        if (input.Length == 0)
        {
            Console.WriteLine("You did not enter a value.");
            return;
        }
        if (input.Length > 1)
        {
            Console.WriteLine("You have entered more than 1 character");
            return;
        }
        var character = input[0];
        if (!validValues.Contains(character))
        {
            Console.WriteLine("You have entered an invalid character");
            return;
        }
        if (enteredValues.Contains(character))
        {
            Console.WriteLine("You have already entered this character");
            return;
        }
        enteredCharacters[i] = character;
    }
    // process numbers.
}

Answer 2

I think this more or less does what you want:

var max = 5;
var array = new char[max];
var letters = "abcdefghij";

var count = 0;
while (count < 5)
{
    Console.WriteLine("Please Enter {0} Letters B/W a through j only: ", max);

    var key = Console.ReadKey();
    var read = key.KeyChar

    if (!letters.Contains(read))
    {
        Console.WriteLine("You have entered an incorrect value");
        continue;
    }

    var found = false;
    for (int i = 0; i < count; i++)
    {
        if (array[i] == read)
        {
            found = true;
        }
    }

    if (found)
    {
        Console.WriteLine("You have entered an duplicate value");
        continue;
    }

    array[count++] = read;
}

Console.WriteLine("You have Entered the following Inputs: ");
for (int i = 0; i < array.Length; i++)
{
    Console.WriteLine(array[i]);
}

Console.ReadKey();

Answer 3

this is you problem

for (int i = 0; i < 5; i++)

this is your fix:

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

                char[] read = Console.ReadLine().ToLower().ToCharArray();

                //loop through array
                for (int i = 0; i < read.Length; i++)
                {
                    if (letters.Contains(read[i]) && !Array.Contains(read[i]))
                    {
                        Array[i] = read[i];
                    }
                    else
                    {
                        Console.WriteLine("You have entered an incorrect value");
                    }

                }

                Console.WriteLine("You have Entered the following Inputs: ");
                for (int i = 0; i < Array.Length; i++)
                {
                    Console.WriteLine(Array[i]);
                }
                Console.ReadKey();
            }