# !/usr/bin/ruby -w
# -*- encoding:utf-8 -*-
# filename: main.rb
# author: 简单教程(www.twle.cn)
# Copyright © 2015-2065 www.twle.cn. All rights reserved.

$global_variable = 13

class HelloWorld

  def print_global
      puts "全局变量在 HelloWorld 中输出为 #$global_variable"
  end
end

class HelloWorld2

  def print_global
      puts "全局变量在 HelloWorld 中输出为 #$global_variable"
  end
end
 
class1obj = HelloWorld.new
class1obj.print_global
$global_variable = 17

class2obj = HelloWorld2.new
class2obj.print_global

$global_variable = 19

puts "全局变量为 : #$global_variable"