How can I convert an integer into its verbal representation?

Question

Is there a library or a class/function that I can use to convert an integer to it\'s verbal representation?

Example input:

4,567,788`

Answer 1

Solution that takes up less code.

The most important part is only couple lines:

static Func remainder = t => t > 0 ? " " + ToEN(t) : "";

public static string ToEN(this long val, double d = 20, long th = 20)
{
    switch ((long)d)
    {
        case 20:   return val >= d ? ToEN(val, 1e2)             : en[val];
        case 100:  return val >= d ? ToEN(val, 1e3, 100)        : en[val / 10 * 10] + remainder(val % 10);
        default:   return val >= d ? ToEN(val, d * 1e3,(long)d) : ToEN(val / th) + " " + en[th] + remainder(val % th);
    }
}

Full code is available here https://dotnetfiddle.net/wjr4hF