Java Code for writing Numbers in Words : public class NumberToWord { private static final String[] specialNames = { "", " thousand", " million", " billion", " trillion", " quadrillion", " quintillion" }; private static final String[] tensNames = { "", " ten", " twenty", " thirty", " forty", " fifty", " sixty", " seventy", " eighty", " ninety" }; private static final String[] numNames = { "", " one", " two", " three", " four", " five", " six", " seven", " eight", " nine", " ten", " eleven", " twelve", " thirteen", " fourteen", " fifteen", " sixteen", " seventeen", " eighteen", " nineteen" }; private String convertLessThanOneThousand(int number) { String current; if (number % 100 0); return (prefix + current).trim(); } public static void main(String[] args) { NumberToWord obj = new NumberToWord(); System.out.println("*** " + obj.convert(123456789)); System.out.println("*** " + obj.convert(-55)); } } one hundred twenty three million four hundred fifty six thousand seven hundred eighty nine negative fifty five