关系用户名，图书的查询，图书的借阅，读者的注销-Relationship between the user name, the book' s information, loan book, the reader' s write-off, etc.

本源码为图书借阅系统，具有图书借阅查询功能，用Visual C++ 6.0直接调试，管理员密码是“mm”。-The source code for the book borrowing system, with a book borrowing query function, with Visual C++ 6.0 direct debugging, the administrator password is mm .