#!/usr/local/bin/ruby

i = 100
@i = 555
class C
  def set_i(value)
    i = value
#    @i = value
  end

  def get_i()
    return @i
#    return i
  end
end

c = C.new()
c.set_i("ok")
p(c.get_i())   # "ok"を表示する