带有进度条的倒计时程序，很有趣味的一个小程序-Countdown program with a progress bar, a very interesting program

自动控制系统，分模式一和模式二，模式二可以控制增减和倒计时，模式a有十种预设-Automatic control systems, sub-mode I and mode II Model II can control and change the countdown, there are ten a preset mode