hello_class.rb

class HelloWorld
    Version = '1.0'

    def initialize(myname="Ruby")
      @name = myname
    end

    def hello
      print "Hello, world. I am ", @name, ".\n"
    end
  end

  bob   = HelloWorld.new("Bob")
  alice = HelloWorld.new("Alice")
  ruby  = HelloWorld.new

  ruby.hello