按键控制电子中程序，51子程序，采用C语言编写，开发工具为KEIL C，代码简单，适合初学者学习，仅供参考。-Key control electronics in the program, 51 subroutines, the use of C language, development tools for the KEIL C, the code is simple, suitable for beginners to learn, for reference only.