Ex. 25

cat.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")
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

puppy = Dog.new("brown", "Labradoodle")
puts "And what\'s this thing?"
puts puppy.speak
puts "Whoa, this one must be a dog! But what kind of dog?"
puts puppy.breed
puts "A Labradoodle? Huh, weird. Well, is it hungry?"
puppy.hungry?
puts "Let\'s feed this puppy"
puppy.feed("steak")
puts "Is our cat hungry now?"
puppy.hungry?