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()