一个猜数字的Ruby小程序

number_guess.rb

#!/usr/bin/ruby -w

#
# 脚本名: NumberGuess.rb
# 版本号: 1.0
# 作者: Yan
# 日期: June 2013
#
# 描述: 一个猜数字的游戏，尽快猜中Ta
#

##### 自定义类 #####

# 定义代表控制台的类
class Screen
  def cls
    puts "\n" * 35  # 屏幕滚动至25行
    puts "\a"       # 响铃，提醒
  end

  def pause
    STDIN.gets      # 用户输入字符串回车后结束
  end
end

# 定义Ruby猜谜游戏的类
class Game
  # 显示游戏开始的页面
  def display_greeting
    Console_Screen.cls
    print "\t\t 欢迎Ruby猜数字游戏！" + "\n\n\n\n\n\n\n\n按回车继续."
    Console_Screen.pause
  end

  # 显示游戏操作方法
  def display_instructions
    Console_Screen.cls
    puts "指令:\n\n"
    puts "这个游戏随机产生1到100的数，你应该尽快地猜中Ta。"
    puts "每次尝试之后，游戏会分析你的输入并给出建议。"
    puts "祝你好运！\n\n\n\n\n"
    print "按回车继续."
    Console_Screen.pause
  end

  # 产生游戏所需的数字
  def generate_number
    randomNo = 1 + rand(100)
  end

  # 游戏控制
  def play_game
    number = generate_number

    loop do
      Console_Screen.cls

      print "\n请输入:"

      reply = STDIN.gets
      reply.chop!
      reply = reply.to_i      # 输入的字符串转成整数

      redo if reply < 0 or reply > 100

      if reply == number
        Console_Screen.cls
        print "恭喜你，猜中了！回车继续."
        Console_Screen.pause
        break
      elsif reply < number
        Console_Screen.cls
        print "太小了！回车继续."
        Console_Screen.pause
      elsif reply > number
        Console_Screen.cls
        print "太大了！回车继续."
        Console_Screen.pause
      end
    end
  end

  # 关于这个游戏
  def display_credits
    Console_Screen.cls

    puts "\t\t感谢玩这个游戏.\n\n\n"
    puts "\n\t\t由jyfeather开发.\n"
    puts "\t\t网址:http://www.yanjin.info\n\n\n"
  end
end

##### 实例化脚本对象 #####

Console_Screen = Screen.new   # 实例化Screen对象
SQ = Game.new                 # 实例化Game对象

SQ.display_greeting           # 执行Game的display_greeting方法
answer = ""                   # 全局变量，用以控制循环

# 无限循环，直到玩家输入'y'或'n'为止
loop do
  Console_Screen.cls
  print "准备好开始玩游戏了吗?(y/n):"
  answer = STDIN.gets
  answer.chop!                # 去掉最后的回车符
  break if answer == 'y' or answer == 'n'
end

# 分析用户的输入
if answer == 'n'
  Console_Screen.cls
  puts "换个时间再来玩哟！\n\n"
else
  SQ.display_instructions     # 显示游戏玩法

  loop do
    SQ.play_game
    Console_Screen.cls
    print "再玩一局？(y/n):"
    playAgain = STDIN.gets
    playAgain.chop!
    break if playAgain == 'n'
  end
  SQ.display_credits          # 显示游戏信息

end

来自 Ruby Programming, Jerry Lee Ford, Jr.