purin.rb

class Purin
	def initialize (hp,attack,defence)
		@hp = hp
		@attack = attack
		@defence = defence
	end
	attr_accessor :hp
	attr_accessor :attack
	attr_accessor :defence

	def utau 
		puts'♪'
		exec 'afplay /System/Library/Sounds/Frog.aiff'
	end
end

p = Purin.new(5,1,3)

p.utau