test.rb

class Person 

	attr_accessor :first_name
	attr_accessor :last_name
	attr_accessor :dob

	attr_reader  :age

	def initialize(first_name, last_name, dob)
		self.first_name = first_name
		self.last_name = last_name
		self.dob = dob
	end

	def print_name
		"My name is #{first_name} #{last_name}"
	end

end

test2.rb

puts "Hello world!"