// C# 2.0 Ninety Nine Bottles of Beer Example
// Bradley Tetzlaff
// 2005-11-23
using System;
namespace NinetyNineBottlesOfBeer
{
///
/// An example of the 99 Bottles of Beer song in C# 2.0,
/// with intentional use of new features of version 2.0.
///
[CLSCompliant(true)]
public static class NinetyNineBottlesOfBeerSong
{
/// Singing method type.
/// The bottle index.
/// The song verse.
private delegate string SingVerseMethod(int bi);
/// The pluralization method type.
/// The bottle index.
///
/// An "bottles" if plural, otherwise "bottle".
///
private delegate string Pluralizer(int bi);
///
/// Prints the 99 Bottles of Beer song to the console.
///
public static void Main()
{
// Lyric Parts
const string LYRICS_SOME = @"
{0} of beer on the wall,
{0} of beer.
Take one down, pass it around,
{1}";
const string LYRICS_NEXT = " of beer on the wall.";
const string LYRICS_NONE = "No more bottles of beer on the wall.";
const string LYRICS_ZERO = @"
No more bottles of beer on the wall,
no more bottles of beer.
Go to the store and buy some more,
99 bottles of beer on the wall.";
// Anonymous Methods
// Returns the correct pluralization of "bottle".
Pluralizer bottles = delegate(int bi)
{ return (bi == 1) ? "1 bottle" : bi + " bottles"; };
// Sings one verse of the 99 Bottles of Beer song.
SingVerseMethod sing = delegate(int bi)
{
if (bi > 0) // More than one beer.
{
return string.Format(LYRICS_SOME, bottles(bi),
bottles(bi - 1) + LYRICS_NEXT);
}
else if (bi == 1) // One beer.
{
return string.Format(LYRICS_SOME, bottles(bi),
LYRICS_NONE);
}
else if (bi == 0) // No beers.
return LYRICS_ZERO;
else
throw new IndexOutOfRangeException("Invalid beer amount.");
};
// Sing all 99.
for (int bi = 99; bi >= 0; bi--)
{
Console.WriteLine(sing(bi));
Console.ReadLine();
}
}
}
}