系统功能需求：

假设学生信息含有：学号、姓名、成绩。要求用单链表表示一个班的学生信息，并能用菜单形式实现如下功能（菜单要能重复使用）：

1、建立单链表

2、输出单链表

3、查找单链表

4、插入单链表

5、删除单链表

6、更新单链表

7、逆置单链表

0、退出系统

-The system functional requirements:

Suppose Student Information includes: Student ID, name, performance. Require a single linked list, said the students information, and can be used to achieve the following functions form the menu (menu to be able to re-use):

1, the establishment of a single linked list

2, the output single-linked list

3, to find a single linked list

4, insert a single linked list

5, to delete a single linked list

6, update a single list

7, reverse a single linked list home

0, exit the system