ex42.rb

# Animal is-a object look at the extra credit
class Animal
end

# ??
class Dog < Animal

  def initialize(name)
    # ??
    @name = name
  end
end

# ??
class Cat < Animal

  def initialize(name)
    # ??
    @name = name
  end
end

# ??
class Person

  def initialize(name)
    # ??
    @name = name

    # Person has-a pet of some kind
    @pet = nil
  end

  attr_accessor :pet
end

# ??
class Employee < Person

  def initialize(name, salary)
    # ?? hmm what is this strange magic?
    super(name)
    # ??
    @salary = salary
  end

end

# ??
class Fish
end

# ??
class Salmon < Fish
end

# ??
class Halibut < Fish
end


# rover is-a Dog
rover = Dog.new("Rover")

# ??
satan = Cat.new("Satan")

# ??
mary = Person.new("Mary")

# ??
mary.pet = satan

# ??
frank = Employee.new("Frank", 120000)

# ??
frank.pet = rover

# ??
flipper = Fish.new()

# ??
crouse = Salmon.new()

# ??
harry = Halibut.new()