[プログラミング入門 - Rubyを使って](http://www.ie.u-ryukyu.ac.jp/~kono/software/s04/tutorial/) の私的解答

01.rb

# coding : utf-8

# 1年は何時間でしょうか？
puts 365 * 24

# 10年間は何分でしょうか？
puts 365 * 10 * 24 * 60

# あなたが生まれてから今日まで何秒たっているでしょうか?
now = Time.now
bd = Time.new(777, 7, 7)
puts (now - bd).to_i

# 私が生まれてから10億3400万秒 たっているとしたら、私は今何歳でしょう?
puts 1034000000 / 60 / 60 / 24 / 365

04_1.rb

# coding : utf-8
 
puts "性は？"
sei = gets.chomp
puts "名は？"
na = gets.chomp
puts "こんにちは。 " + sei.to_s + " " + na.to_s + " さん。"

04_2.rb

# coding : utf-8
 
puts "好きな数字は？"
number = gets.chomp.to_i
puts (number + 1).to_s + "をおすすめします。"

05_1.rb

# coding: utf-8
 
puts "なにが望みだ"
command = gets.chomp
puts "なにぃ? " + command.to_s + " だとー!! おまえは首だ!!"

05_2.rb

# coding: utf-8
 
lineWidth = 40
 
puts "目  次".center(lineWidth)
puts
puts "1章:  数".ljust(lineWidth/2) + "p. 1".rjust(lineWidth/2)
puts "2章:  文字".ljust(lineWidth/2) + "p. 72".rjust(lineWidth/2)
puts "3章:  変数".ljust(lineWidth/2) + "p. 118".rjust(lineWidth/2)

06_1.rb

# coding: utf-8

bottles = 99
 
while bottles != 0
  puts bottles.to_s + "Bottles of beer on the wall"
  puts bottles.to_s + "Bottles of beer"
  puts "Take one down and pass it around"
  bottles -= 1
  puts bottles.to_s + "Bottles of beer on the wall"
  puts
end

06_2.rb

# coding: utf-8
 
said = gets.chomp
 
while said != "BYE"
  while said != said.upcase or said == ""
    puts "は?! もっと大きな声で話しておくれ、坊や!"
    said = gets.chomp
  end
  while said == said.upcase and said != "BYE" and said != ""
    year = rand(20) + 1930
    puts "いやー、" + year.to_s + "年以来ないねー!"
    said = gets.chomp
  end
end

06_3.rb

# coding: utf-8
 
bbamemory = 0
said = gets.chomp
 
while bbamemory != 2
  while bbamemory == 0
    while said != said.upcase or said == ""
      puts "は?! もっと大きな声で話しておくれ、坊や!"
      said = gets.chomp
 
      while said == said.upcase and said != "BYE" and said != ""
        year = rand(20) + 1930
        puts "いやー、" + year.to_s + "年以来ないねー!"
        said = gets.chomp
      end
    end
    if said == "BYE"
      puts "なんだって？"
      said = gets.chomp
      if said == "BYE"
        bbamemory += 1
      else
        bbamemory = 0
      end
    end
    while bbamemory == 1
      puts "え？なんだって？？？"
      said = gets.chomp
      if said == "BYE"
        bbamemory += 1
      else
        bbamemory = 0
      end
    end
  end
end

06_3_byebyebye.rb

# coding: utf-8
 
bbamemory = 0
said = ""
 
while bbamemory != 3
 
  while bbamemory == 0
    puts "なんだって？"
    said = gets.chomp
    if said == "BYE"
      bbamemory += 1
    else
      bbamemory = 0
    end
 
    while bbamemory == 1
      puts "え？なんだって？？？"
      said = gets.chomp
      if said == "BYE"
        bbamemory += 1
      else
        bbamemory = 0
      end
 
      while bbamemory == 2
        puts "ああああああああああ"
        said = gets.chomp
        if said == "BYE"
          bbamemory += 1
        else
          bbamemory = 0
        end
      end
 
    end
 
  end
 
end

06_4.rb

# coding: utf-8
 
puts "開始の年は？"
startYear = gets.to_i
puts "終わりの年は？"
finishYear = gets.to_i
 
puts "うるう年一覧"
for num in startYear..finishYear
  x = num % 4
  y = num % 100
  z = num % 400
  if x == 0 and y != 0
    puts num
  end
  if z == 0
    puts num
  end
end

06_4_kairyou.rb

# coding: utf-8
 
puts "開始の年は？"
startYear = gets.to_i
puts "終わりの年は？"
finishYear = gets.to_i
 
puts "うるう年一覧"
startYear += 4 - startYear % 4 if startYear % 4 != 0
while startYear <= finishYear
  if startYear % 100 != 0 or startYear % 400 == 0
    puts startYear
  end
  startYear += 4
end

07_1.rb

# coding: utf-8
 
word = []
newWord =
 
puts "好きな言葉を入力してね。終了するには何も入力しないでReturnを押してね。"
while newWord != ""
  newWord = gets.chomp
  word << newWord
end
 
puts "あなたの好きな言葉をアルファベット順に並べるよ"
puts word.sort

07_3.rb

# coding: utf-8
 
lineWidth = 40
 
mokuji = ["目  次".center(lineWidth), "1章:  数".ljust(lineWidth/2) + "p. 1".rjust(lineWidth/2), "2章:  文字".ljust(lineWidth/2) + "p. 72".rjust(lineWidth/2), "3章:  変数".ljust(lineWidth/2) + "p. 118".rjust(lineWidth/2)]
 
puts mokuji

08_1.rb

#coding: utf-8

def englishNumber number
  if number < 0
    return '負でない数を入力してください.'
  end
  if number == 0
    return 'zero'
  end

  numString = ''

  onesPlace = ['one',     'two',       'three',    'four',     'five',               'six',     'seven',     'eight',    'nine']
  tensPlace = ['ten',     'twenty',    'thirty',   'forty',    'fifty',               'sixty',   'seventy',   'eighty',   'ninety']
  teenagers = ['eleven',  'twelve',    'thirteen', 'fourteen', 'fifteen',               'sixteen', 'seventeen', 'eighteen', 'nineteen']

  # start 1000

  left  = number
  write = left/1000
  left  = left - write*1000

  if write > 0
    thousands = englishNumber write
    numString = numString + thousands + ' thousand'
     if left > 0
      numString = numString + ' '
    end
  end

  # end 1000

  # start 100

  write = left/100
  left  = left - write*100

  if write > 0
    hundreds  = englishNumber write
    numString = numString + hundreds + ' hundred'
     if left > 0
      numString = numString + ' '
    end
  end

  # end 100

  # start 10

  write = left/10
  left  = left - write*10
  if write > 0
    if ((write == 1) and (left > 0))
      numString = numString + teenagers[left-1]
      left = 0
    else
      numString = numString + tensPlace[write-1]
    end
    if left > 0
      numString = numString + '-'
    end
  end

  # end 10

  # start 1

  write = left
  left  = 0
  if write > 0
    numString = numString + onesPlace[write-1]
  end

  # end 1

  numString
end

puts englishNumber(  0)
puts englishNumber( 10)
puts englishNumber( 11)
puts englishNumber(100)
puts englishNumber(101)
puts englishNumber(234)
puts englishNumber(1000)
puts englishNumber(3211)
puts englishNumber(5268)
puts englishNumber(1000000)
puts englishNumber(1001000)

08_2.rb

#coding: utf-8
 
def englishNumber number
  if number < 0
    return '負でない数を入力してください.'
  end
  if number == 0
    return 'zero'
  end
 
  numString = ''
 
  onesPlace = ['one',     'two',       'three',    'four',     'five',               'six',     'seven',     'eight',    'nine']
  tensPlace = ['ten',     'twenty',    'thirty',   'forty',    'fifty',               'sixty',   'seventy',   'eighty',   'ninety']
  teenagers = ['eleven',  'twelve',    'thirteen', 'fourteen', 'fifteen',               'sixteen', 'seventeen', 'eighteen', 'nineteen']
 
  # 増やしたい任意の桁を大きい順に配列に入れる
  numPlace = [1000000000000, 1000000000, 1000000, 1000, 100]
  numPlaceWords = [' trillion', ' billion', ' million', ' thousand', ' hundred']
 
  # start over 100
 
  left  = number
  counter = 0
  length = numPlace.length - 1
  for counter in 0..length
    write = left / numPlace[counter]
    left = left - write * numPlace[counter]
    if write > 0
      containner = englishNumber write
      numString = numString + containner + numPlaceWords[counter]
      if left > 0
        numString = numString + ' '
      end
    end
  end
 
  # end over 100
 
  # start 10
 
  write = left/10
  left  = left - write*10
  if write > 0
    if ((write == 1) and (left > 0))
      numString = numString + teenagers[left-1]
      left = 0
    else
      numString = numString + tensPlace[write-1]
    end
    if left > 0
      numString = numString + '-'
    end
  end
 
  # end 10
 
  # start 1
 
  write = left
  left  = 0
  if write > 0
    numString = numString + onesPlace[write-1]
  end
 
  # end 1
 
  numString
end
 
puts englishNumber(  0)
puts englishNumber(  9)
puts englishNumber( 10)
puts englishNumber( 11)
puts englishNumber( 17)
puts englishNumber( 32)
puts englishNumber( 88)
puts englishNumber( 99)
puts englishNumber(100)
puts englishNumber(101)
puts englishNumber(234)
puts englishNumber(3211)
puts englishNumber(999999)
puts englishNumber(1000000000000)

08_3.rb

#coding: utf-8
 
def englishNumber number
  if number < 0
    return '負でない数を入力してください.'
  end
  if number == 0
    return 'zero'
  end
 
  numString = ''
 
  onesPlace = ['one',     'two',       'three',    'four',     'five',               'six',     'seven',     'eight',    'nine']
  tensPlace = ['ten',     'twenty',    'thirty',   'forty',    'fifty',               'sixty',   'seventy',   'eighty',   'ninety']
  teenagers = ['eleven',  'twelve',    'thirteen', 'fourteen', 'fifteen',               'sixteen', 'seventeen', 'eighteen', 'nineteen']
 
  # 増やしたい任意の桁を大きい順に配列に入れる
  numPlace = [1000000000000, 1000000000, 1000000, 1000, 100]
  numPlaceWords = [' trillion', ' billion', ' million', ' thousand', ' hundred']
 
  # start over 100
 
  left  = number
  counter = 0
  length = numPlace.length - 1
  for counter in 0..length
    write = left / numPlace[counter]
    left = left - write * numPlace[counter]
    if write > 0
      containner = englishNumber write
      numString = numString + containner + numPlaceWords[counter]
      if left > 0
        numString = numString + ' and '
      end
    end
  end
 
  # end over 100
 
  # start 10
 
  write = left/10
  left  = left - write*10
  if write > 0
    if ((write == 1) and (left > 0))
      numString = numString + teenagers[left-1]
      left = 0
    else
      numString = numString + tensPlace[write-1]
    end
    if left > 0
      numString = numString + ' and '
    end
  end
 
  # end 10
 
  # start 1
 
  write = left
  left  = 0
  if write > 0
    numString = numString + onesPlace[write-1]
  end
 
  # end 1
 
  numString
end
 
puts englishNumber(  0)
puts englishNumber(  9)
puts englishNumber( 10)
puts englishNumber( 11)
puts englishNumber( 17)
puts englishNumber( 32)
puts englishNumber( 88)
puts englishNumber( 99)
puts englishNumber(100)
puts englishNumber(101)
puts englishNumber(234)
puts englishNumber(3211)
puts englishNumber(999999)
puts englishNumber(1000000000000)

08_4.rb

#coding: utf-8
 
def englishNumber number
  if number < 0
    return '負でない数を入力してください.'
  end
  if number == 0
    return 'zero'
  end
 
  numString = ''
 
  onesPlace = ['one',     'two',       'three',    'four',     'five',               'six',     'seven',     'eight',    'nine']
  tensPlace = ['ten',     'twenty',    'thirty',   'forty',    'fifty',               'sixty',   'seventy',   'eighty',   'ninety']
  teenagers = ['eleven',  'twelve',    'thirteen', 'fourteen', 'fifteen',               'sixteen', 'seventeen', 'eighteen', 'nineteen']
 
  # 増やしたい任意の桁を大きい順に配列に入れる
  numPlace = [1000000000000, 1000000000, 1000000, 1000, 100]
  numPlaceWords = [' trillion', ' billion', ' million', ' thousand', ' hundred']
 
  # start over 100
 
  left  = number
  counter = 0
  length = numPlace.length - 1
  for counter in 0..length
    write = left / numPlace[counter]
    left = left - write * numPlace[counter]
    if write > 0
      containner = englishNumber write
      numString = numString + containner + numPlaceWords[counter]
      if left > 0
        numString = numString + ' '
      end
    end
  end
 
  # end over 100
 
  # start 10
 
  write = left/10
  left  = left - write*10
  if write > 0
    if ((write == 1) and (left > 0))
      numString = numString + teenagers[left-1]
      left = 0
    else
      numString = numString + tensPlace[write-1]
    end
    if left > 0
      numString = numString + '-'
    end
  end
 
  # end 10
 
  # start 1
 
  write = left
  left  = 0
  if write > 0
    numString = numString + onesPlace[write-1]
  end
 
  # end 1
 
  numString
end
 
def beer beerNumber
  num = englishNumber beerNumber
  while beerNumber != 0
    puts num.to_s + " Bottles of beer on the wall"
    puts num.to_s + " Bottles of beer"
    puts "Take one down and pass it around"
    beerNumber -= 1
    num = englishNumber beerNumber
    puts num.to_s + " Bottles of beer on the wall"
    puts
  end
end
 
beer 1000

09_1.rb

# coding: utf-8
require 'date'
 
myBD = Time.new(777, 07, 07, 07, 07, 07) + 1000000000
puts myBD

09_2.rb

# coding : utf-8
 
puts "生まれた年は?"
year = gets.chomp.to_i
puts "生まれた月は?"
month = gets.chomp.to_i
puts "生まれた日は?"
day = gets.chomp.to_i
 
bd = Time.mktime(year, month, day)
now = Time.now
 
old = (now - bd) / 31556926 # 一年の正確な秒数
year += 1
cnt = 0
 
while cnt < old.to_i
  puts year.to_s + "年" + month.to_s + "月" + day.to_s + "日 誕生日おめでとう！"
  year += 1
  cnt += 1
end

09_3.rb

# coding : utf-8
 
class OrangeTree
 
  def initialize
    @height = rand(50) + 50
    @time = 0
    @oranges = 0
  end
 
  def checkHeight
    if @time != 0
      puts @time.to_s + "年経ちました。"
    else
      puts "木が生えました"
    end
    puts "現在、オレンジの木は" + @height.to_s + "cmです。"
  end
 
  def oneYearPasses
    @time += 1
    @oranges = 0
    @height = @height + rand(100) + 50
    dead
  end
 
  def countTheOranges
    if @time > 3 and @time < 5
      @oranges = rand(10) + 1
      puts @oranges.to_s + "個のオレンジが生っています。"
    end
    if @time > 5 and @time < 9
      @oranges = rand(10) + 5
      puts @oranges.to_s + "個のオレンジが生っています。"
    end
    if @time == 10
      @oranges = rand(10) + 10
      puts @oranges.to_s + "個のオレンジが生っています。"
    end
  end
 
  def pichAnOrange
      if @oranges != 0
        puts "オレンジを１つ摘みました。"
        @oranges -= 1
        puts "とてもおいしゅうございました。"
      end
      if @oranges == 0
        puts "オレンジはないよ！"
      end
  end
 
private
 
  def dead
    if @time == 11
      puts "木は死んでしまいました。"
      exit
    end
  end
 
end
 
 
orange = OrangeTree.new
orange.checkHeight
orange.oneYearPasses
orange.checkHeight
orange.countTheOranges
orange.pichAnOrange
orange.oneYearPasses
orange.checkHeight
orange.countTheOranges
orange.pichAnOrange
orange.oneYearPasses
orange.checkHeight
orange.countTheOranges
orange.pichAnOrange
orange.oneYearPasses
orange.checkHeight
orange.countTheOranges
orange.pichAnOrange
orange.oneYearPasses
orange.checkHeight
orange.countTheOranges
orange.pichAnOrange
orange.oneYearPasses
orange.checkHeight
orange.countTheOranges
orange.pichAnOrange
orange.oneYearPasses
orange.checkHeight
orange.countTheOranges
orange.pichAnOrange
orange.oneYearPasses
orange.checkHeight
orange.countTheOranges
orange.pichAnOrange
orange.oneYearPasses
orange.checkHeight
orange.countTheOranges
orange.pichAnOrange
orange.oneYearPasses
orange.checkHeight
orange.countTheOranges
orange.pichAnOrange
orange.oneYearPasses
orange.checkHeight
orange.countTheOranges
orange.pichAnOrange

09_4.rb

#coding : utf-8
 
class Dragon
 
  def talk
    while @program != 0
      puts @name + " に対する指示を数字で入力してください。\n1:feed , 2:walk , 3:putToBed , 4:toss , 5:rock"
      command = gets.chomp.to_i
      if command == 1
        feed
      elsif command == 2
        walk
      elsif command == 3
        putToBed
      elsif command == 4
        toss
      elsif command == 5
        rock
      end
    end
  end
 
 
  def initialize name
    @name = name
    @asleep = false
    @stuffInBelly     = 10
    @stuffInIntestine =  0
    puts @name + ' は生まれました.'
    @program = 1
  end
 
  def feed
    puts 'あなたは ' + @name + 'に食べ物を与えます.'
    @stuffInBelly = 10
    passageOfTime
  end
 
  def walk
    puts 'あなたは ' + @name + 'をトイレに連れて行きます.'
    @stuffInIntestine = 0
    passageOfTime
  end
 
  def putToBed
    puts 'あなたは ' + @name + ' を寝かしつけます.'
    @asleep = true
    3.times do
      if @asleep
        passageOfTime
      end
      if @asleep
        puts @name + ' はいびきをかいて, 部屋中煙だらけ.'
      end
    end
    if @asleep
      @asleep = false
      puts @name + ' はゆっくり目を覚ます.'
    end
  end
 
  def toss
    puts 'あなたは ' + @name + ' を空中に投げ上げます.'
    puts '彼はキャハキャハ笑い, あなたの眉毛は焼け焦げた.'
    passageOfTime
  end
 
  def rock
    puts 'あなたは ' + @name + ' を優しく揺すります.'
    @asleep = true
    puts '彼は短くうとうと...'
    passageOfTime
    if @asleep
      @asleep = false
      puts '...でもやめるとすぐ起きちゃう.'
    end
  end
 
  private
 
  def hungry?
    #  メソッドの名前は"?"で終わることができます。
    #  通常、メソッドがtrueかfalseのどちらかを返すときだけ、
    #  この名前を使います。このように:
    @stuffInBelly <= 2
  end
 
  def poopy?
    #うんちが出そう?
    @stuffInIntestine >= 8
  end
 
  def passageOfTime
    if @stuffInBelly > 0
      #  食べたものは、胃から腸へ移動
      @stuffInBelly     = @stuffInBelly     - 1
      @stuffInIntestine = @stuffInIntestine + 1
    else  #  私たちのドラゴンは飢えました!
      if @asleep
        @asleep = false
        puts '彼は突然跳び起きます!'
      end
      puts @name + ' は飢え死にしそう!  死に物狂いの彼は"あなた"を食べてしまいました!'
      @program = 0
      exit  #  プログラムを終了します。
    end
 
    if @stuffInIntestine >= 10
      @stuffInIntestine = 0
      puts 'おっと!  ' + @name + ' はやっちゃったようです...'
    end
 
    if hungry?
      if @asleep
        @asleep = false
        puts '彼は突然起きます!'
      end
      puts @name + 'のおなかはゴロゴロ言ってます...'
    end
 
    if poopy?
      if @asleep
        @asleep = false
        puts '彼は突然起きます!'
      end
      puts @name + ' はうんちをしたくて踊っています...'
    end
  end
 
end
 
pet = Dragon.new 'Norbert'
pet.talk

10_1.rb

# coding : utf-8
 
def gfClock &block
  cnt = 0
  now = Time.now.hour
  if now <= 12
    now += 1
  end
  if now >= 13
    now -= 12
  end
  while cnt != now # now回処理を繰り返す
    block.call
    cnt += 1
  end
end
 
gfClock do
    puts 'DONG!'
  end

10_2.rb

# coding : utf-8
 
def log description, &block
  puts '開始 "' + description.to_s + 'ブロック"...'
  puts '..."' + description.to_s + 'ブロック"終了, 返り値は: ' + block.call.to_s
end
 
log '外' do
  log 'ある小さな' do
    5
  end
  log 'もうひとつの' do
    'I like Thai food!'
  end
  false
end

10_3.rb

# coding : utf-8
 
def log description, &block
  $nestingDepth = " " * $nestingDepth.to_i
  puts $nestingDepth.to_s + '開始 "' + description.to_s + 'ブロック"...'
  puts $nestingDepth.to_s + '..."' + description.to_s + 'ブロック"終了, 返り値は: ' + block.call.to_s
end
 
log '外' do
  $nestingDepth = 1
  log 'ある小さな' do
    $nestingDepth = 2
    log 'ちっちゃな' do
      'lots of love'
    end
    42
  end
  $nestingDepth = 1
  log 'もうひとつの' do
    'I love Indian food!'
  end
  true
end