polymorphism.rb

require 'pry'
class Animal
	def initialize(name)
		@name = name
	end
	def say()
		begin
			raise NotImplementedError, "something goes wrong"
		rescue Exception
			puts $! 
		end

	end
end

class Cat < Animal
	def say()
		"#{@name}: Meow Meow!"
	end
end

class Dog < Animal
	def say()
		"#{@name}: Wolf Wolf!"
	end
end

class Bird < Animal

end

cat = Cat.new('Michael')
puts cat.say()
dog = Dog.new('Gof')
puts dog.say()

animal = Animal.new('alien')
puts animal.say()

bird = Bird.new('Jiji')
puts bird.say()