gistfile1.txt

class Point
    attr_accessor :user

    def initialize(user)  
      @user = user
    end  

    def calc_point_num
      unless self.user.point_num
        return 101
      end
      100
    end

end

DummyUser = Class.new do  
  def initialize(point_num)  
    @point_num  = point_num
  end  
  attr_reader :point_num
end 

user = DummyUser.new(10)
point = Point.new(user)
puts point.calc_point_num