/* 
 * 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.
 */

using System;

using NUnit.Framework;

namespace Lucene.Net.Util
{
	
	
	public class English
	{
		
		public static System.String IntToEnglish(int i)
		{
			System.Text.StringBuilder result = new System.Text.StringBuilder();
			IntToEnglish(i, result);
			return result.ToString();
		}
		
		public static void  IntToEnglish(int i, System.Text.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;
				}
		}
		
		[STAThread]
		public static void  Main(System.String[] args)
		{
			System.Console.Out.WriteLine(IntToEnglish(System.Int32.Parse(args[0])));
		}
	}
}