Ruby - フロー制御(whileループとif文、break文)

開発環境

• OS X Lion - Apple(OS)
• TextWrangler(Text Editor) (いずれはBBEditを入手したい！)
• Script言語:Ruby

『初めてのプログラミング 第2版』(Chris Pine　著、長尾 高弘　訳、オライリー・ジャパン、2010年、ISBN978-4-87311-469-9)の5章(フロー制御),　7.5(練習問題)、「壁にビールが99本」を解いてみる。

「壁にビールが99本」

コード(TextWrangler)

#!/usr/bin/env ruby #encoding: utf-8 num = 5 while true puts "#{num} bottles of beer on the wall, #{num} bottles of beer!" num -= 1 break if num == 1 puts "Take one down, pass it around, #{num} bottles of beer on the wall!" end puts "Take one down, pass it around, #{num} bottle of beer on the wall!" puts "#{num} bottle of beer on the wall, #{num} bottle of beer!" puts "Take one down, pass it around, no more bottles of beer on the wall!"

入出力結果(Terminal)

$ ./ruby_program.rb 5 bottles of beer on the wall, 5 bottles of beer! Take one down, pass it around, 4 bottles of beer on the wall! 4 bottles of beer on the wall, 4 bottles of beer! Take one down, pass it around, 3 bottles of beer on the wall! 3 bottles of beer on the wall, 3 bottles of beer! Take one down, pass it around, 2 bottles of beer on the wall! 2 bottles of beer on the wall, 2 bottles of beer! Take one down, pass it around, 1 bottle of beer on the wall! 1 bottle of beer on the wall, 1 bottle of beer! Take one down, pass it around, no more bottles of beer on the wall! $