Write a recursive java method named printNumber(int n) that takes a single integ

Question

Write a recursive java method named printNumber(int n) that takes a single integer argument, n, and prints the value of n using standard English words. You can assume n is less than one million. For example, printNumber(-24549) should produce the output "minus twenty four thousand five hundred forty nine"

Explanation / Answer

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 < 20){ current = numNames[number % 100]; number /= 100; } else { current = numNames[number % 10]; number /= 10; current = tensNames[number % 10] + current; number /= 10; } if (number == 0) return current; return numNames[number] + " hundred" + current; } public String convert(int number) { if (number == 0) { return "zero"; } String prefix = ""; if (number < 0) { number = -number; prefix = "negative"; } String current = ""; int place = 0; do { int n = number % 1000; if (n != 0){ String s = convertLessThanOneThousand(n); current = s + specialNames[place] + current; } place++; number /= 1000; } while (number > 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)); } }

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