01.5.11.NumbersIntoText

using System;

class NumbersIntoText
{
    static void Main()
    {
        long workNumber = long.Parse(Console.ReadLine());
        long divider = 0;
        long digitCheck = 0;
        long remainderCheck = 0;
        long remainder = 0;
        long i = 0;

        if (workNumber <= 19)
        {
            switch (workNumber)
            {
                case 0:
                    Console.WriteLine("Zero ");
                    break;
                case 1:
                    Console.WriteLine("One ");
                    break;
                case 2:
                    Console.WriteLine("Two ");
                    break;
                case 3:
                    Console.WriteLine("Three ");
                    break;
                case 4:
                    Console.WriteLine("Four ");
                    break;
                case 5:
                    Console.WriteLine("Five ");
                    break;
                case 6:
                    Console.WriteLine("Six ");
                    break;
                case 7:
                    Console.WriteLine("Seven ");
                    break;
                case 8:
                    Console.WriteLine("Eight ");
                    break;
                case 9:
                    Console.WriteLine("Nine ");
                    break;
                case 10:
                    Console.WriteLine("Ten ");
                    break;
                case 11:
                    Console.WriteLine("Eleven ");
                    break;
                case 12:
                    Console.WriteLine("Twelve ");
                    break;
                case 13:
                    Console.WriteLine("Thirteen ");
                    break;
                case 14:
                    Console.WriteLine("Fourteen ");
                    break;
                case 15:
                    Console.WriteLine("Fifteen ");
                    break;
                case 16:
                    Console.WriteLine("Sixteen ");
                    break;
                case 17:
                    Console.WriteLine("Seventeen ");
                    break;
                case 18:
                    Console.WriteLine("Eighteen ");
                    break;
                case 19:
                    Console.WriteLine("Nineteen ");
                    break;
                default:
                    Console.WriteLine("Invalid number");
                    break;
            }
        }

        else if (workNumber > 19 && workNumber<100)
        {
            for (long j = 100; j >= 1; j = j / 10)
            {

                divider = j;
                digitCheck = workNumber / divider;
                remainderCheck = workNumber % divider;
                //remainder = digitCheck % 10;
                if (remainder != 0 || j <= workNumber)
                {
                    i++;
                }
                //Console.WriteLine(remainder);
                if (i >= 1 && j <= workNumber)
                {

                    if (j == 10)
                    {
                        switch (digitCheck)
                        {
                            case 2:
                                Console.Write("Twenty");
                                break;
                            case 3:
                                Console.Write("Thirty");
                                break;
                            case 4:
                                Console.Write("Fourty");
                                break;
                            case 5:
                                Console.Write("Fifty");
                                break;
                            case 6:
                                Console.Write("Sisty");
                                break;
                            case 7:
                                Console.Write("Seventy");
                                break;
                            case 8:
                                Console.Write("Eighty");
                                break;
                            case 9:
                                Console.Write("Ninety");
                                break;
                            default:
                                Console.WriteLine("Invalid number in Leva");
                                break;
                        }

                        switch (remainderCheck)
                        {
                            case 0:
                                Console.WriteLine(" ");
                                break;
                            case 1:
                                Console.WriteLine(" one ");
                                break;
                            case 2:
                                Console.WriteLine(" two ");
                                break;
                            case 3:
                                Console.WriteLine(" three ");
                                break;
                            case 4:
                                Console.WriteLine(" four ");
                                break;
                            case 5:
                                Console.WriteLine(" five ");
                                break;
                            case 6:
                                Console.WriteLine(" six ");
                                break;
                            case 7:
                                Console.WriteLine(" seven ");
                                break;
                            case 8:
                                Console.WriteLine(" eight ");
                                break;
                            case 9:
                                Console.WriteLine(" nine ");
                                break;
                            default:
                                Console.WriteLine("Invalid number");
                                break;
                        }
                    }
                }
            }
        }
        else if (workNumber > 99 && workNumber < 1000)
        {
            for (long j = 100; j >= 1; j = j / 10)
            {

                divider = j;
                digitCheck = workNumber / divider;
                remainderCheck = workNumber % divider;
                //remainder = digitCheck % 10;
                if (remainder != 0 || j <= workNumber)
                {
                    i++;
                }
                //Console.WriteLine(remainder);
                if (i >= 1 && j <= workNumber || remainder==0)
                {
                    if (j == 100)
                    {
                        switch (digitCheck)
                        {
                            case 1:
                                Console.Write("One hundred ");
                                break;
                            case 2:
                                Console.Write("Two hundred ");
                                break;
                            case 3:
                                Console.Write("Three hundred ");
                                break;
                            case 4:
                                Console.Write("Four hundred ");
                                break;
                            case 5:
                                Console.Write("Five hundred ");
                                break;
                            case 6:
                                Console.Write("Six hundred ");
                                break;
                            case 7:
                                Console.Write("Seven hundred ");
                                break;
                            case 8:
                                Console.Write("Eight hundred ");
                                break;
                            case 9:
                                Console.Write("Nine hundred ");
                                break;
                            default:
                                Console.WriteLine("Invalid number ");
                                break;
                        }
                        workNumber = remainderCheck;
                    }
                    if (j == 10)
                    {
                        if (workNumber < 20)
                        {
                            switch (workNumber)
                            {
                                case 1:
                                    Console.WriteLine("and one ");
                                    break;
                                case 2:
                                    Console.WriteLine("and two ");
                                    break;
                                case 3:
                                    Console.WriteLine("and three ");
                                    break;
                                case 4:
                                    Console.WriteLine("and four ");
                                    break;
                                case 5:
                                    Console.WriteLine("and five ");
                                    break;
                                case 6:
                                    Console.WriteLine("and six ");
                                    break;
                                case 7:
                                    Console.WriteLine("and seven ");
                                    break;
                                case 8:
                                    Console.WriteLine("and eight ");
                                    break;
                                case 9:
                                    Console.WriteLine("and nine ");
                                    break;
                                case 10:
                                    Console.WriteLine("and ten ");
                                    break;
                                case 11:
                                    Console.WriteLine("and eleven ");
                                    break;
                                case 12:
                                    Console.WriteLine("and twelve ");
                                    break;
                                case 13:
                                    Console.WriteLine("and thirteen ");
                                    break;
                                case 14:
                                    Console.WriteLine("and fourteen ");
                                    break;
                                case 15:
                                    Console.WriteLine("and fifteen ");
                                    break;
                                case 16:
                                    Console.WriteLine("and sixteen ");
                                    break;
                                case 17:
                                    Console.WriteLine("and seventeen ");
                                    break;
                                case 18:
                                    Console.WriteLine("and eighteen ");
                                    break;
                                case 19:
                                    Console.WriteLine("and nineteen ");
                                    break;
                            }
                        }
                        else
                        {
                            switch (digitCheck)
                            {
                                case 2:
                                    Console.Write("and twenty");
                                    break;
                                case 3:
                                    Console.Write("and thirty");
                                    break;
                                case 4:
                                    Console.Write("and fourty");
                                    break;
                                case 5:
                                    Console.Write("and fifty");
                                    break;
                                case 6:
                                    Console.Write("and sisty");
                                    break;
                                case 7:
                                    Console.Write("and seventy");
                                    break;
                                case 8:
                                    Console.Write("and eighty");
                                    break;
                                case 9:
                                    Console.Write("and ninety");
                                    break;
                            }

                            switch (remainderCheck)
                            {
                                case 0:
                                    Console.WriteLine(" ");
                                    break;
                                case 1:
                                    Console.WriteLine(" one ");
                                    break;
                                case 2:
                                    Console.WriteLine(" two ");
                                    break;
                                case 3:
                                    Console.WriteLine(" three ");
                                    break;
                                case 4:
                                    Console.WriteLine(" four ");
                                    break;
                                case 5:
                                    Console.WriteLine(" five ");
                                    break;
                                case 6:
                                    Console.WriteLine(" six ");
                                    break;
                                case 7:
                                    Console.WriteLine(" seven ");
                                    break;
                                case 8:
                                    Console.WriteLine(" eight ");
                                    break;
                                case 9:
                                    Console.WriteLine(" nine ");
                                    break;
                            }
                        }
                    }
                }
            }
        }
    }
}