学习C++，先学串口编程，本程序就是以串口作为编程对象，进行针对串口的数据接收与发送，内含丰富的注释，纯个人理解！-To learn C++ learn first serial programming, the program is as a programming object to the serial port for serial data reception and transmission, contains a wealth of comments, pure personal

C语言图书管理系统，注释明了，简单易懂，纯C语言，Visual C++环境编译。-C language library management system, comments clear, easy to understand, pure C language, Visual C++ compiler environment.