这是我自己编写的一个键盘输入的闹钟定时程序，由于本人的开发板上只有4位数码管，所以只能显示分和秒（分可以写到99，秒只能写最大60）。运行成功。可能代码不够简洁，但条理清晰。-This is what I have written a regular keyboard input of the alarm clock procedures, developed as a result of my board, only four digital tube, we can only show the minutes, and seconds (99 minutes to write, writing can only be the greatest 60 seconds). Successful operation. Code may be simple enough, but the clarity.