3.4 object-oriented programming I

cat.rb

class Cat
  attr_reader :color, :breed
  attr_accessor :name 

  def initialize(color, breed)
    @color = color
    @breed = breed
    @hungry = true
  end

  def feed(food)
  puts "Mmmm, " + food + "!"
  @hungry = false
  end

  def hungry?
    if @hungry
      puts "I'm hungry!"
    else
      puts "I'm full!"
    end
    @hungry
  end

  def speak
    puts "Meow!"
  end
end
kitty = Cat.new("grey", "Persian")
puts "Let's inspect our new cat:"
puts kitty.inspect
puts "What class does our new cat belong to?"
puts kitty.class
puts "Is our new cat an object?"
puts kitty.is_a?(Object)
puts "What color is our cat?"
puts kitty.color
puts "Let's give our new cat a name"
kitty.name = "Betsy"
puts kitty.name
puts "Is our cat hungry now?"
kitty.hungry?
puts "Let's feed our cat"
kitty.feed("tuna")
puts "Is our cat hungry now?"
kitty.hungry?
puts "Our cat can make noise"
kitty.speak