exercise 3.5

pets.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 Dog < Pet
    def speak
      puts "Woof!"
    end
  end
  
  class Cat < Pet
      def speak
        puts "Meow!"
      end
  end
  
  
  puppy = Dog.new("black brown", "Pure-bred Mop")
  puppy.speak
  puts puppy.breed
  
  
  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 car 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