Object Oriented Programming I and II

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 "Mmmmm, " + 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 out cat hungry now?"
kitty.hungry?
puts "Our cat can make noise"
kitty.speak

pet.rb

class Pet
  attr_reader :color, :breed
  attr_accessor :name
  def initialize(color, breed)
    @color = color
    @breed = breed
    @hungry = true
  end
  def feed(food)
    puts "Mmmmm, " + food + "!"
    @hungry = false
  end
  def hungry?
    if @hungry
      puts "I\'m hungry!"
    else 
      puts "I\'m full!"
    end
    @hungry
  end
end

class Cat < Pet
  def speak
    puts "Meow! I'm Garfield"
  end
end

class Dog < Pet
  def speak
    puts "Woof!"
  end
end

puppy = Dog.new("black", "Staffordshire Terrier")
puppy.speak
puts puppy.breed

kitty = Cat.new("orange", "Persian")
kitty.speak
puts kitty.breed