Exercise 25

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 "Mmmm, " + 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!"
  end
end

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

kitty = Cat.new("grey", "Persian")
puppy = Dog.new("black", "Staffordshire Terrier")
puppy.speak
puts puppy.breed
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