initial commit ex45

ex45.rb

@@ -0,0 +1,95 @@
+#!/usr/bin/env ruby
+
+## Animal is-a object (yes, sort of confusing) look at the extra credit
+class Animal
+
+end
+
+## Dog is-a Animal
+class Dog < Animal
+
+  def initialize(name)
+    ## dog has-a name
+    @name = name
+  end
+
+end
+
+## Cat is-a Animal
+class Cat < Animal
+
+  def initialize(name)
+    ## cat has-a name
+    @name = name
+  end
+
+end
+
+## Person is-a object
+class Person
+
+  attr_accessor :pet
+
+  def initialize(name)
+    ## person has-a name
+    @name = name
+
+    ## Person has-a pet of some kind
+    @pet = nil
+  end
+
+end
+
+## Employee is-a Person
+class Employee < Person
+
+  def initialize(name, salary)
+    ## ?? hmm what is this strange magic?
+    super(name)
+    ## employee has-a salary
+    @salary = salary
+  end
+
+end
+
+## Fish is-a Object
+class Fish
+
+end
+
+## Salmon is-a Fish
+class Salmon < Fish
+
+end
+
+## Halibut is-a Fish
+class Halibut < Fish
+
+end
+
+## rover is-a Dog
+rover = Dog.new("Rover")
+
+## satan is-a Cat
+satan = Cat.new("Satan")
+
+## mary is-a Person
+mary = Person.new("Mary")
+
+## mary has-a cat
+mary.pet = satan
+
+## frank is-a employee
+frank = Employee.new("Frank", 120000)
+
+## frank has-a dog
+frank.pet = rover
+
+## flipper is-a fish
+flipper = Fish.new
+
+## crouse is-a salmon
+crouse = Salmon.new
+
+## harry is-a halibut
+harry = Halibut.new