English.java

package org.apache.lucene.util;

/**
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */


public class English {

  public static String intToEnglish(int i) {
    StringBuilder result = new StringBuilder();
    intToEnglish(i, result);
    return result.toString();
  }

  public static void intToEnglish(int i, StringBuilder result) {
    if (i == 0) {
      result.append("zero");
      return;
    }
    if (i < 0) {
      result.append("minus ");
      i = -i;
    }
    if (i >= 1000000000) {			  // billions
      intToEnglish(i/1000000000, result);
      result.append("billion, ");
      i = i%1000000000;
    }
    if (i >= 1000000) {				  // millions
      intToEnglish(i/1000000, result);
      result.append("million, ");
      i = i%1000000;
    }
    if (i >= 1000) {				  // thousands
      intToEnglish(i/1000, result);
      result.append("thousand, ");
      i = i%1000;
    }
    if (i >= 100) {				  // hundreds
      intToEnglish(i/100, result);
      result.append("hundred ");
      i = i%100;
    }
    if (i >= 20) {
      switch (i/10) {
      case 9 : result.append("ninety"); break;
      case 8 : result.append("eighty"); break;
      case 7 : result.append("seventy"); break;
      case 6 : result.append("sixty"); break;
      case 5 : result.append("fifty"); break;
      case 4 : result.append("forty"); break;
      case 3 : result.append("thirty"); break;
      case 2 : result.append("twenty"); break;
      }
      i = i%10;
      if (i == 0)
        result.append(" ");
      else 
        result.append("-");
    }
    switch (i) {
    case 19 : result.append("nineteen "); break;
    case 18 : result.append("eighteen "); break;
    case 17 : result.append("seventeen "); break;
    case 16 : result.append("sixteen "); break;
    case 15 : result.append("fifteen "); break;
    case 14 : result.append("fourteen "); break;
    case 13 : result.append("thirteen "); break;
    case 12 : result.append("twelve "); break;
    case 11 : result.append("eleven "); break;
    case 10 : result.append("ten "); break;
    case 9 : result.append("nine "); break;
    case 8 : result.append("eight "); break;
    case 7 : result.append("seven "); break;
    case 6 : result.append("six "); break;
    case 5 : result.append("five "); break;
    case 4 : result.append("four "); break;
    case 3 : result.append("three "); break;
    case 2 : result.append("two "); break;
    case 1 : result.append("one "); break;
    case 0 : result.append(""); break;
    }
  }

  public static void main(String[] args) {
    System.out.println(intToEnglish(Integer.parseInt(args[0])));
  }

}