EnglishNumber

public class EnglishNumber {
  private static final String[] ones = {"", " one", " two", " three", " four",
    " five", " six", " seven", " eight", " nine", " ten", " eleven", " twelve",
    " thirteen", " fourteen", " fifteen", " sixteen", " seventeen",
    " eighteen", " nineteen"};
  private static final String[] tens = {"", "", " twenty", " thirty", " forty",
    " firty", " sixty", " seventy", " eighty", " ninety"};
  private static final String[] groups = {"", " thousand", " million",
    " billion", " trillion", " quadrillion", " quintillion"};
  private String string = "";

  public String getString() {
    return string;
  }

  @Override
  public String toString() {
    return getString();
  }

  public EnglishNumber(long n) {
    for (int i = groups.length - 1; i >= 0; i--) {
      long cutoff = (long )Math.pow((double )10, (double )(i * 3));
      if (n >= cutoff) {
        int thisPart = (int )(n / cutoff);
        if (thisPart >= 100) {
          string += ones[thisPart / 100] + " hundred";
          thisPart %= 100;
        }
        if (thisPart >= 20) {
          string += tens[thisPart / 10];
          thisPart %= 10;
        }
        if (thisPart >= 1) {
          string += ones[thisPart];
        }
        string += groups[i];
        n %= cutoff;
      }
    }
    if (string.length() == 0) {
      string = "zero";
    }
    else {
      string = string.substring(1);
    }
  }

  public static void main(String[] args) {
    for (int i = 0; i < 31; i++) {
      System.out.println(new EnglishNumber(i));
    }
    System.out.println(new EnglishNumber(100));
    System.out.println(new EnglishNumber(101));
    System.out.println(new EnglishNumber(1000));
    System.out.println(new EnglishNumber(1001));
    System.out.println(new EnglishNumber(10000));
    System.out.println(new EnglishNumber(10001));
    System.out.println(new EnglishNumber(100000));
    System.out.println(new EnglishNumber(100001));
    System.out.println(new EnglishNumber(1000000));
    System.out.println(new EnglishNumber(1000001));
    System.out.println(new EnglishNumber(10000000));
    System.out.println(new EnglishNumber(10000001));
    System.out.println(new EnglishNumber(100000000));
    System.out.println(new EnglishNumber(100000001));
    System.out.println(new EnglishNumber(1000000000));
    System.out.println(new EnglishNumber(1000000001));
    System.out.println(new EnglishNumber(10000000000L));
    System.out.println(new EnglishNumber(10000000001L));
    System.out.println(new EnglishNumber(100000000000L));
    System.out.println(new EnglishNumber(100000000001L));
    System.out.println(new EnglishNumber(1000000000000L));
    System.out.println(new EnglishNumber(1000000000001L));
    System.out.println(new EnglishNumber(10000000000000L));
    System.out.println(new EnglishNumber(10000000000001L));
    System.out.println(new EnglishNumber(100000000000000L));
    System.out.println(new EnglishNumber(100000000000001L));
    System.out.println(new EnglishNumber(1000000000000000L));
    System.out.println(new EnglishNumber(1000000000000001L));
    System.out.println(new EnglishNumber(10000000000000000L));
    System.out.println(new EnglishNumber(10000000000000001L));
    System.out.println(new EnglishNumber(100000000000000000L));
    System.out.println(new EnglishNumber(100000000000000001L));
  }
}