class Animal
  def initialize(name)
    @name = name
  end
 
  def play()
  end
end
 
class Dog < Animal
  def initialize(name)
    super(name)
  end
 
  def play()
    print "わんわん！" + @name + "だよ\n" 
  end
end
 
class Cat < Animal
  def initialize(name, sleep)
    super(name)
    @sleep = sleep
  end
 
  def play()
    print "にゃあ！" + @name + "だよ\n"
    if(@sleep == 1) then
      print "...でも寝る\n"
    end
  end
end
 
pets = [ Dog.new("ぽち"), Cat.new("たま", 1) ]
 
pets.each {|pet|
  pet.play()
}
 

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