Ruby - 数値を英語に変換(「壁にビールが99本」)

開発環境

• OS X Lion - Apple(OS)
• TextWrangler(Text Editor) (BBEditの機能制限無料版、light版)
• 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10章(章全部で復習), 10.5(練習問題の続き)「壁にビールが99本」を解いてみる。

その他参考書籍

• 『プログラミング言語 Ruby』David Flanagan, まつもと ゆきひろ　著 、卜部 昌平　監訳、長尾 高弘　訳、オライリー・ジャパン、2009年、ISBN978-4-87311-394-4)

「壁にビールが99本」

コード(TextWrangler)

#!/usr/bin/env ruby
#encoding: utf-8

def english_number number
  return '負ではない数値を入力してください。' if number < 0
  return 'zero' if number == 0
  
  num_string = ''
  
  ones_place = ['one','two','three',
                'four','five','six',
                'seven','eight','nine']
  tens_place = ['ten','twenty','thirty',
                'forty','fifty','sixty',
                'seventy','eighty','ninety']
  teenagers = ['eleven','twelve','thirteen',
               'fourteen','fifteen','sixteen',
               'seventeen','eighteen','nineteen']
  others = [['hundred',2],
            ['thousand',3],
            ['million',6],
            ['billion',9],
            ['trillion',12]]
  
  left = number
  while others.length > 0
    other = others.pop
    write = left / (10 ** other[1])
    left = left - write * (10 ** other[1])
    if write > 0
      pre = english_number write
      num_string = num_string + pre + ' ' + other[0]
      if left > 0
        num_string += ' '
      end
    end
  end
  
  write = left / 10
  left = left - write * 10
  
  if write > 0
    if((write == 1) and (left > 0))
      num_string += teenagers[left -1]

      left = 0
    else
      num_string += tens_place[write - 1]
    end
    
    if left > 0
      num_string += '-'
    end
  end
  
  write = left
  left = 0
  
  if write > 0
    num_string += ones_place[write - 1]
  end
  
  num_string
end

n = 99
while 1
  puts "#{english_number n} bottles of beer on the wall, #{english_number n} bottles of beer!"
  n -= 1
  break if n == 1
  puts "Take one down, pass it around, #{english_number n} bottles of beer on the wall!"
end
puts "Take one down, pass it around, #{english_number n} bottle of beer on the waall!"
puts "#{english_number n} bottle of beer on the wall, #{english_number n} 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
ninety-nine bottles of beer on the wall, ninety-nine bottles of beer!
Take one down, pass it around, ninety-eight bottles of beer on the wall!
ninety-eight bottles of beer on the wall, ninety-eight bottles of beer!
Take one down, pass it around, ninety-seven bottles of beer on the wall!
ninety-seven bottles of beer on the wall, ninety-seven bottles of beer!
Take one down, pass it around, ninety-six bottles of beer on the wall!
ninety-six bottles of beer on the wall, ninety-six bottles of beer!
Take one down, pass it around, ninety-five bottles of beer on the wall!
ninety-five bottles of beer on the wall, ninety-five bottles of beer!
Take one down, pass it around, ninety-four bottles of beer on the wall!
ninety-four bottles of beer on the wall, ninety-four bottles of beer!
Take one down, pass it around, ninety-three bottles of beer on the wall!
ninety-three bottles of beer on the wall, ninety-three bottles of beer!
Take one down, pass it around, ninety-two bottles of beer on the wall!
ninety-two bottles of beer on the wall, ninety-two bottles of beer!
Take one down, pass it around, ninety-one bottles of beer on the wall!
ninety-one bottles of beer on the wall, ninety-one bottles of beer!
Take one down, pass it around, ninety bottles of beer on the wall!
ninety bottles of beer on the wall, ninety bottles of beer!
Take one down, pass it around, eighty-nine bottles of beer on the wall!
eighty-nine bottles of beer on the wall, eighty-nine bottles of beer!
Take one down, pass it around, eighty-eight bottles of beer on the wall!
eighty-eight bottles of beer on the wall, eighty-eight bottles of beer!
Take one down, pass it around, eighty-seven bottles of beer on the wall!
eighty-seven bottles of beer on the wall, eighty-seven bottles of beer!
Take one down, pass it around, eighty-six bottles of beer on the wall!
eighty-six bottles of beer on the wall, eighty-six bottles of beer!
Take one down, pass it around, eighty-five bottles of beer on the wall!
eighty-five bottles of beer on the wall, eighty-five bottles of beer!
Take one down, pass it around, eighty-four bottles of beer on the wall!
eighty-four bottles of beer on the wall, eighty-four bottles of beer!
Take one down, pass it around, eighty-three bottles of beer on the wall!
eighty-three bottles of beer on the wall, eighty-three bottles of beer!
Take one down, pass it around, eighty-two bottles of beer on the wall!
eighty-two bottles of beer on the wall, eighty-two bottles of beer!
Take one down, pass it around, eighty-one bottles of beer on the wall!
eighty-one bottles of beer on the wall, eighty-one bottles of beer!
Take one down, pass it around, eighty bottles of beer on the wall!
eighty bottles of beer on the wall, eighty bottles of beer!
Take one down, pass it around, seventy-nine bottles of beer on the wall!
seventy-nine bottles of beer on the wall, seventy-nine bottles of beer!
Take one down, pass it around, seventy-eight bottles of beer on the wall!
seventy-eight bottles of beer on the wall, seventy-eight bottles of beer!
Take one down, pass it around, seventy-seven bottles of beer on the wall!
seventy-seven bottles of beer on the wall, seventy-seven bottles of beer!
Take one down, pass it around, seventy-six bottles of beer on the wall!
seventy-six bottles of beer on the wall, seventy-six bottles of beer!
Take one down, pass it around, seventy-five bottles of beer on the wall!
seventy-five bottles of beer on the wall, seventy-five bottles of beer!
Take one down, pass it around, seventy-four bottles of beer on the wall!
seventy-four bottles of beer on the wall, seventy-four bottles of beer!
Take one down, pass it around, seventy-three bottles of beer on the wall!
seventy-three bottles of beer on the wall, seventy-three bottles of beer!
Take one down, pass it around, seventy-two bottles of beer on the wall!
seventy-two bottles of beer on the wall, seventy-two bottles of beer!
Take one down, pass it around, seventy-one bottles of beer on the wall!
seventy-one bottles of beer on the wall, seventy-one bottles of beer!
Take one down, pass it around, seventy bottles of beer on the wall!
seventy bottles of beer on the wall, seventy bottles of beer!
Take one down, pass it around, sixty-nine bottles of beer on the wall!
sixty-nine bottles of beer on the wall, sixty-nine bottles of beer!
Take one down, pass it around, sixty-eight bottles of beer on the wall!
sixty-eight bottles of beer on the wall, sixty-eight bottles of beer!
Take one down, pass it around, sixty-seven bottles of beer on the wall!
sixty-seven bottles of beer on the wall, sixty-seven bottles of beer!
Take one down, pass it around, sixty-six bottles of beer on the wall!
sixty-six bottles of beer on the wall, sixty-six bottles of beer!
Take one down, pass it around, sixty-five bottles of beer on the wall!
sixty-five bottles of beer on the wall, sixty-five bottles of beer!
Take one down, pass it around, sixty-four bottles of beer on the wall!
sixty-four bottles of beer on the wall, sixty-four bottles of beer!
Take one down, pass it around, sixty-three bottles of beer on the wall!
sixty-three bottles of beer on the wall, sixty-three bottles of beer!
Take one down, pass it around, sixty-two bottles of beer on the wall!
sixty-two bottles of beer on the wall, sixty-two bottles of beer!
Take one down, pass it around, sixty-one bottles of beer on the wall!
sixty-one bottles of beer on the wall, sixty-one bottles of beer!
Take one down, pass it around, sixty bottles of beer on the wall!
sixty bottles of beer on the wall, sixty bottles of beer!
Take one down, pass it around, fifty-nine bottles of beer on the wall!
fifty-nine bottles of beer on the wall, fifty-nine bottles of beer!
Take one down, pass it around, fifty-eight bottles of beer on the wall!
fifty-eight bottles of beer on the wall, fifty-eight bottles of beer!
Take one down, pass it around, fifty-seven bottles of beer on the wall!
fifty-seven bottles of beer on the wall, fifty-seven bottles of beer!
Take one down, pass it around, fifty-six bottles of beer on the wall!
fifty-six bottles of beer on the wall, fifty-six bottles of beer!
Take one down, pass it around, fifty-five bottles of beer on the wall!
fifty-five bottles of beer on the wall, fifty-five bottles of beer!
Take one down, pass it around, fifty-four bottles of beer on the wall!
fifty-four bottles of beer on the wall, fifty-four bottles of beer!
Take one down, pass it around, fifty-three bottles of beer on the wall!
fifty-three bottles of beer on the wall, fifty-three bottles of beer!
Take one down, pass it around, fifty-two bottles of beer on the wall!
fifty-two bottles of beer on the wall, fifty-two bottles of beer!
Take one down, pass it around, fifty-one bottles of beer on the wall!
fifty-one bottles of beer on the wall, fifty-one bottles of beer!
Take one down, pass it around, fifty bottles of beer on the wall!
fifty bottles of beer on the wall, fifty bottles of beer!
Take one down, pass it around, forty-nine bottles of beer on the wall!
forty-nine bottles of beer on the wall, forty-nine bottles of beer!
Take one down, pass it around, forty-eight bottles of beer on the wall!
forty-eight bottles of beer on the wall, forty-eight bottles of beer!
Take one down, pass it around, forty-seven bottles of beer on the wall!
forty-seven bottles of beer on the wall, forty-seven bottles of beer!
Take one down, pass it around, forty-six bottles of beer on the wall!
forty-six bottles of beer on the wall, forty-six bottles of beer!
Take one down, pass it around, forty-five bottles of beer on the wall!
forty-five bottles of beer on the wall, forty-five bottles of beer!
Take one down, pass it around, forty-four bottles of beer on the wall!
forty-four bottles of beer on the wall, forty-four bottles of beer!
Take one down, pass it around, forty-three bottles of beer on the wall!
forty-three bottles of beer on the wall, forty-three bottles of beer!
Take one down, pass it around, forty-two bottles of beer on the wall!
forty-two bottles of beer on the wall, forty-two bottles of beer!
Take one down, pass it around, forty-one bottles of beer on the wall!
forty-one bottles of beer on the wall, forty-one bottles of beer!
Take one down, pass it around, forty bottles of beer on the wall!
forty bottles of beer on the wall, forty bottles of beer!
Take one down, pass it around, thirty-nine bottles of beer on the wall!
thirty-nine bottles of beer on the wall, thirty-nine bottles of beer!
Take one down, pass it around, thirty-eight bottles of beer on the wall!
thirty-eight bottles of beer on the wall, thirty-eight bottles of beer!
Take one down, pass it around, thirty-seven bottles of beer on the wall!
thirty-seven bottles of beer on the wall, thirty-seven bottles of beer!
Take one down, pass it around, thirty-six bottles of beer on the wall!
thirty-six bottles of beer on the wall, thirty-six bottles of beer!
Take one down, pass it around, thirty-five bottles of beer on the wall!
thirty-five bottles of beer on the wall, thirty-five bottles of beer!
Take one down, pass it around, thirty-four bottles of beer on the wall!
thirty-four bottles of beer on the wall, thirty-four bottles of beer!
Take one down, pass it around, thirty-three bottles of beer on the wall!
thirty-three bottles of beer on the wall, thirty-three bottles of beer!
Take one down, pass it around, thirty-two bottles of beer on the wall!
thirty-two bottles of beer on the wall, thirty-two bottles of beer!
Take one down, pass it around, thirty-one bottles of beer on the wall!
thirty-one bottles of beer on the wall, thirty-one bottles of beer!
Take one down, pass it around, thirty bottles of beer on the wall!
thirty bottles of beer on the wall, thirty bottles of beer!
Take one down, pass it around, twenty-nine bottles of beer on the wall!
twenty-nine bottles of beer on the wall, twenty-nine bottles of beer!
Take one down, pass it around, twenty-eight bottles of beer on the wall!
twenty-eight bottles of beer on the wall, twenty-eight bottles of beer!
Take one down, pass it around, twenty-seven bottles of beer on the wall!
twenty-seven bottles of beer on the wall, twenty-seven bottles of beer!
Take one down, pass it around, twenty-six bottles of beer on the wall!
twenty-six bottles of beer on the wall, twenty-six bottles of beer!
Take one down, pass it around, twenty-five bottles of beer on the wall!
twenty-five bottles of beer on the wall, twenty-five bottles of beer!
Take one down, pass it around, twenty-four bottles of beer on the wall!
twenty-four bottles of beer on the wall, twenty-four bottles of beer!
Take one down, pass it around, twenty-three bottles of beer on the wall!
twenty-three bottles of beer on the wall, twenty-three bottles of beer!
Take one down, pass it around, twenty-two bottles of beer on the wall!
twenty-two bottles of beer on the wall, twenty-two bottles of beer!
Take one down, pass it around, twenty-one bottles of beer on the wall!
twenty-one bottles of beer on the wall, twenty-one bottles of beer!
Take one down, pass it around, twenty bottles of beer on the wall!
twenty bottles of beer on the wall, twenty bottles of beer!
Take one down, pass it around, nineteen bottles of beer on the wall!
nineteen bottles of beer on the wall, nineteen bottles of beer!
Take one down, pass it around, eighteen bottles of beer on the wall!
eighteen bottles of beer on the wall, eighteen bottles of beer!
Take one down, pass it around, seventeen bottles of beer on the wall!
seventeen bottles of beer on the wall, seventeen bottles of beer!
Take one down, pass it around, sixteen bottles of beer on the wall!
sixteen bottles of beer on the wall, sixteen bottles of beer!
Take one down, pass it around, fifteen bottles of beer on the wall!
fifteen bottles of beer on the wall, fifteen bottles of beer!
Take one down, pass it around, fourteen bottles of beer on the wall!
fourteen bottles of beer on the wall, fourteen bottles of beer!
Take one down, pass it around, thirteen bottles of beer on the wall!
thirteen bottles of beer on the wall, thirteen bottles of beer!
Take one down, pass it around, twelve bottles of beer on the wall!
twelve bottles of beer on the wall, twelve bottles of beer!
Take one down, pass it around, eleven bottles of beer on the wall!
eleven bottles of beer on the wall, eleven bottles of beer!
Take one down, pass it around, ten bottles of beer on the wall!
ten bottles of beer on the wall, ten bottles of beer!
Take one down, pass it around, nine bottles of beer on the wall!
nine bottles of beer on the wall, nine bottles of beer!
Take one down, pass it around, eight bottles of beer on the wall!
eight bottles of beer on the wall, eight bottles of beer!
Take one down, pass it around, seven bottles of beer on the wall!
seven bottles of beer on the wall, seven bottles of beer!
Take one down, pass it around, six bottles of beer on the wall!
six bottles of beer on the wall, six bottles of beer!
Take one down, pass it around, five bottles of beer on the wall!
five bottles of beer on the wall, five bottles of beer!
Take one down, pass it around, four bottles of beer on the wall!
four bottles of beer on the wall, four bottles of beer!
Take one down, pass it around, three bottles of beer on the wall!
three bottles of beer on the wall, three bottles of beer!
Take one down, pass it around, two bottles of beer on the wall!
two bottles of beer on the wall, two bottles of beer!
Take one down, pass it around, one bottle of beer on the waall!
one bottle of beer on the wall, one bottle of beer!
Take one down, pass it around, no more bottles of beer on the wall!
$

今回の周ではirb(インタラクティブRuby)も少しずつ活用してみることに。

• 独習Ruby 株式会社テクノロジックアート (著)
• Learning Ruby Michael Fitzgerald (著)

本書を続けつつ、上記の本を入手したらそっちに切り替え。