图书信息包括：登录号、书名、作者名、分类号、出版单位、出版时间、价格、存在状态（已借和已还）、借书人姓名、性别、学号等。试设计一图书信息管理系统，使之能提供以下功能：

系统以菜单方式工作(用键盘输入1~5之间的数来选择功能)

（1）图书信息录入功能(图书信息用文件保存)－－输入

（2）图书信息浏览功能－－输出

（3）查询功能：按书名查询或按作者名查询(至少一种查询方式)

(4) 图书信息的删除：按照存在状态删除，把已还的图书信息删除。

(5) 图书信息的修改：按照存在状态修改，把已借的图书信息改为已还的状态-Book information including: registration number, title, author names, words, publishers, publishing time, price, presence status (and has also been borrowed), the borrower' s name, gender, or number. Try to design a library information management system, so that it can provide the following features: the menu system to work the way (with keyboard input between 1 to 5 to select a function) (1) book information input function (book information stored with the file)-- Input (2) book information browsing- Output (3) query functions: Query by title or by author name check (at least one query) delete (4) Book Information: Delete accordance with existing state, has also put book information deleted. Modify (5) book information: According to the existence of the state changes, the book information has been changed by the state has also