我制作的是一个简易的图书馆管理系统。在图书馆管理系统中首先要通过一个登录界面输入用户名和密码正确了才可以登录进系统（以借书证号登录时输入：用户名111,密码为1即可登录），进入系统后可在查询、修改和帮助这三个菜单项中选择，查询菜单项可进行借书查询和书籍查询，修改项可进行密码修改（因为该系统是对学生开放的，故姓名、学号等修改都不提供，只是提供密码的修改），帮助项可以看到借书须知和帮助。-I made a simple library management system. First, in the library management system through a login screen to enter a user name and password are correct before you can log into the system (to enter the library Zhenghao login: user name 111 and password to log in to 1), after the query into the system , modify, and help select the three menu items, the query can be menu items and books library query query to modify password entry can be modified (because the system is open to students, so the name, student number and other changes do not provide only provide the password changes) to help library and you will see instructions and help.