How to convert number to words in java

Question

We currently have a crude mechanism to convert numbers to words (e.g. using a few static arrays) and based on the size of the number translating that into an english text. B

Answer 1

/* this program will display number in words
for eg. if you enter 101,it will show "ONE HUNDRED AND ONE"*/

import java.util.*;

public class NumToWords {
  String string;
  String st1[] = { "", "one", "two", "three", "four", "five", "six", "seven",
                   "eight", "nine", };
  String st2[] = { "hundred", "thousand", "lakh", "crore" };
  String st3[] = { "ten", "eleven", "twelve", "thirteen", "fourteen",
                   "fifteen", "sixteen", "seventeen", "eighteen", "ninteen", };
  String st4[] = { "twenty", "thirty", "fourty", "fifty", "sixty", "seventy",
                   "eighty", "ninety" };

  public String convert(int number) {
    int n = 1;
    int word;
    string = "";
    while (number != 0) {
      switch (n) {
        case 1:
          word = number % 100;
          pass(word);
          if (number > 100 && number % 100 != 0) {
            show("and ");
            //System.out.print("ankit");
          }
          number /= 100;
          break;
        case 2:
          word = number % 10;
          if (word != 0) {
            show(" ");
            show(st2[0]);
            show(" ");
            pass(word);
          }
          number /= 10;
          break;
        case 3:
          word = number % 100;
          if (word != 0) {
            show(" ");
            show(st2[1]);
            show(" ");
            pass(word);
          }
          number /= 100;
          break;
        case 4:
          word = number % 100;
          if (word != 0) {
            show(" ");
            show(st2[2]);
            show(" ");
            pass(word);
          }
          number /= 100;
          break;
        case 5:
          word = number % 100;
          if (word != 0) {
            show(" ");
            show(st2[3]);
            show(" ");
            pass(word);
          }
          number /= 100;
          break;
        }
        n++;
      }
      return string;
    }

  public void pass(int number) {
    int word, q;
    if (number < 10) {
      show(st1[number]);
    }
    if (number > 9 && number < 20) {
      show(st3[number - 10]);
    }
    if (number > 19) {
      word = number % 10;
      if (word == 0) {
        q = number / 10;
        show(st4[q - 2]);
      } else {
        q = number / 10;
        show(st1[word]);
        show(" ");
        show(st4[q - 2]);
      }
    }
  }

  public void show(String s) {
    String st;
    st = string;
    string = s;
    string += st;
  }

  public static void main(String[] args) {
    NumToWords w = new NumToWords();
    Scanner input = new Scanner(System.in);
    System.out.print("Enter Number: ");
    int num = input.nextInt();
    String inwords = w.convert(num);
    System.out.println(inwords);
  }
}