NumbersInWords

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

class NumbersWords
{
    static void Main(string[] args)
    {
        string numberStr;
        int number;
        while (true)
        {
            Console.Write("Enter number: ");
            numberStr = Console.ReadLine();
            try
            {
                number = int.Parse(numberStr);
                if (number > 999 || number < 0)
                {
                    Console.WriteLine("Number out of range. Try again.");
                    Console.WriteLine();
                    continue;
                }
                else
                {
                    break;
                }
            }
            catch (FormatException)
            {

                Console.WriteLine("Wrong format. Try Again.");
                Console.WriteLine();
            }
        }

        int arrayIndex = 0;
        int[] digits = new int[3];
        while (number != 0)
        {
            digits[arrayIndex] = number % 10;
            number = number / 10;
            arrayIndex++;
        }
        digits = digits.Reverse().ToArray();
        string numberInWords = "";
        string[] hundreds =
            {"One hundred", "Two hundred", "Three hundred","Four hundred","Five hundred", "Six hundred","Seven hundred", "Eight hundred", "Nine hundred"};
        string[] tensTwentyNinety =
                {"Twenty", "Thrirty", "Fourty", "Fifty", "Sixty", "Seventy", "Eghthy", "Ninety"};
        string[] tensTenNineteen =
            {"Ten", "Eleven", "Twelve", "Thirteen", "Fourteen", "Fifteen", "Sixteen", "Seventeen", "Eighteen", "Nineteen"};
        string[] units =
            {"Zero", "One", "Two", "Three", "Four", "Five", "Six", "Seven", "Eight", "Nine"};

        if (digits[0] != 0)
        {
            numberInWords = numberInWords + hundreds[digits[0] - 1] + " ";
            if (digits[1] != 0 || digits[2] != 0)
            {
                numberInWords = numberInWords + "and ";
            }
        }

        if (digits[1] != 0)
        {
            if (digits[1] > 1 && digits[1] < 10)
            {
                numberInWords = numberInWords + tensTwentyNinety[digits[1] - 2] + " ";
            }
            else
            {
                if (numberInWords == "")
                {
                    numberInWords = numberInWords + tensTenNineteen[digits[2]];
                }
                else
                {
                    numberInWords = numberInWords + tensTenNineteen[digits[2]].ToLower();
                }
            }
        }

        if (digits[1] != 1 && digits[2] != 0)
        {
            numberInWords = numberInWords + units[digits[2]];
        }
        else if (numberInWords == "")
        {
            numberInWords = numberInWords + units[digits[2]];
        }
        Console.WriteLine(numberInWords);
    }
}