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

In case anyone wants a JavaScript version

Number.prototype.numberToWords = function () {
    var unitsMap = ["zero", "one", "two", "three", "four", "five", "six", "seven", "eight", "nine", "ten", "eleven", "twelve", "thirteen", "fourteen", "fifteen", "sixteen", "seventeen", "eighteen", "nineteen"];
    var tensMap = ["zero", "ten", "twenty", "thirty", "forty", "fifty", "sixty", "seventy", "eighty", "ninety"];

    var num = this.valueOf();
    if (Math.round(num == 0)) {
        return "zero";
    }
    if (num < 0) {
        var positivenum = Math.abs(num);
        return "minus " + Number(positivenum).numberToWords();
    }
    var words = "";
    if (Math.floor(num / 1000000) > 0) {
        words += Math.floor(num / 1000000).numberToWords() + " million ";
        num = Math.floor(num % 1000000);
    }
    if (Math.floor(num / 1000) > 0) {
        words += Math.floor(num / 1000).numberToWords() + " thousand ";
        num = Math.floor(num % 1000);
    }
    if (Math.floor(num / 100) > 0) {
        words += Math.floor(num / 100).numberToWords() + " hundred ";
        num = Math.floor(num % 100);
    }
    if (Math.floor(num > 0)) {
        if (words != "") {
            words += "and ";
        }
        if (num < 20) {
        words += unitsMap[num];
        }
        else {
            words += tensMap[Math.floor(num / 10)];
            if ((num % 10) > 0) {
                words += "-" + unitsMap[Math.round(num % 10)];
            }
        }
    }
    return words.trim();
}