C# – Convert Numbers into Words

Convert Money Numbers into Strings

public static string NumberToWords(int number)

{

    if (number == 0)

        return "ZERO";

    if (number < 0)

        return "MINUS " + NumberToWords(Math.Abs(number));

    string words = "";

    if ((number / 1000000) > 0)

    {

        words += NumberToWords(number / 1000000) + " MILLION ";

        number %= 1000000;

    }

    if ((number / 1000) > 0)

    {

        words += NumberToWords(number / 1000) + " THOUSAND ";

        number %= 1000;

    }

    if ((number / 100) > 0)

    {

        words += NumberToWords(number / 100) + " HUNDRED ";

        number %= 100;

    }

    if (number > 0)

    {

        if (words != "")

            words += "AND ";

        var unitsMap = new[] { "ZERO", "ONE", "TWO", "THREE", "FOUR", "FIVE", "SIX", "SEVEN", "EIGHT", "NINE", "TEN", "ELEVEN", "TWELVE", "THIRTEEN", "FOURTEEN", "FIFTEEN", "SIXTEEN", "SEVENTEEN", "EIGHTEEN", "NINETEEN" };

        var tensMap = new[] { "ZERO", "TEN", "TWENTY", "THIRTY", "FORTY", "FIFTY", "SIXTY", "SEVENTY", "EIGHTY", "NINETY" };

        if (number < 20)

            words += unitsMap[number];

        else

        {

            words += tensMap[number / 10];

            if ((number % 10) > 0)

                words += "-" + unitsMap[number % 10];

        }

    }

    return words;

}