一个简单的电子时钟，能够显示当前的时间。

用LED显示；初始时间由键盘设定，并设定一个按键来切换显示的格式：12小时制和24小时制。具备闹钟功能，当设定的时间到达时，通过蜂鸣器播放一段音乐。

-A simple electronic clock that can display the current time. LED display　initial time from the keyboard settings, and set a button to switch the display format: 12-hour and 24-hour clock. With alarm function, when the set time is reached, play some music through the buzzer.