图书借还系统，具体要求如下：

1）　　每人每次只允许借1本；累计最多5本，否则不能借阅。

2）　　一次可以还书多本。

3）　　能够随时显示学生累计情况、书库库存情况。

4）　　能够随时保存学生累计情况、书库库存情况。　　

-Book circulation system requirements are as follows: 1) Each person is only allowed to borrow one　total up to five, or can not borrow. 2) You can also book once more this. 3) can be displayed at any student cumulative cases, library inventory. 4) can be saved at any time the student cumulative cases, library inventory.