NumberToWord.dib

#!meta

{"kernelInfo":{"defaultKernelName":"csharp","items":[{"aliases":[],"name":"csharp"}]}}

#!csharp

static string[] ones = { "one", "two", "three", "four", "five", "six", "seven", "eight", "nine", "ten" };
static string[] teens = { "eleven", "twelve", "thirteen", "fourteen", "fifteen", "sixteen", "seventeen", "eighteen", "nineteen" };
static string[] tens = { "", "", "twenty", "thirty", "forty", "fifty", "sixty", "seventy", "eighty", "ninety" };
static string[] suffixes = { "", "thousand", "million", "billion" };

#!csharp

static string NumberToWords(int number)
{
    if (number >= 1 && number <= 10)
    {
        return ones[number - 1];
    }
    else if (number >= 11 && number <= 19)
    {
        return teens[number - 11];
    }
    else if (number >= 20 && number <= 99)
    {
        var remainder = number % 10;
        return $"{tens[number / 10]}{(remainder != 0 ? $"-{ones[remainder - 1]}" : "")}";
    }
    else if (number >= 100 && number <= 999)
    {
        var remainder = number % 100;
        return $"{ones[number / 100 - 1]} hundred{(remainder != 0 ? $" and {NumberToWords(remainder)}" : "")}";
    }
    else
    {
        for (int i = suffixes.Length - 1; i >= 0; i--)
        {
            var magnitude = (int)Math.Pow(10, 3 * i);
            if (number >= magnitude)
            {
                var quotient = number / magnitude;
                var remainder = number % magnitude;
                return $"{NumberToWords(quotient)} {suffixes[i]}{(remainder != 0 ? $" {NumberToWords(remainder)}" : "")}";
            }
        }

        return "zero";
    }
}

#!csharp

NumberToWords(1)

#!csharp

NumberToWords(10)

#!csharp

NumberToWords(100)

#!csharp

NumberToWords(151)

#!csharp

NumberToWords(1111)

#!csharp

NumberToWords(1125)

#!csharp

static void Main(string[] args)
{
    while (true)
    {
        Console.Write("< ");
        var input = Console.ReadLine();
        try
        {
            var sanitized = input.Replace("_", "");
            var words = NumberToWords(int.Parse(sanitized));
            Console.WriteLine("> " + words);
        }
        catch (Exception ex)
        {
            Console.WriteLine(ex);
            break;
        }
    }
}

Haven't actually run the last cell there

Hmm, how does this work?

It's basically a leaner version of an ipynb. Install Polyglot Notebooks extension for vscode and enjoy interactive notebooks with C#, F#, javscript and probably a few other languages I forget. Even all in one notebook sharing variables if you like that.