学生管理系统

（1）录入学生成绩信息包括学号、姓名、选修课成绩、实验课成绩及必须课成绩。

（2）实现查找功能，输入学生学号查找相关的学生成绩等相关信息。

（3）实现删除功能，输入学号删除相关的学生成绩的相关信息。

（4）实现修改功能，输入相应学号修改该学号外的其他信息。

（5）实现插入功能，输入要插入的位置，在该位置进行插入操作。

（6）实现排序功能，按三门课的总成绩进行由高到低排序。

（7）统计学生人数。

-Student management system

(1) entry student achievement information, including student id, name, elective course performance, experimental results and must class results.

(2) to realize search function, input students student id to find relevant student performance and other related information.

(3) to realize delete function, input student id delete related student achievement information.

(4) to realize modification function, input corresponding student id to change the learn special edition of the other information.

(5) achieve insert function, input to insert position, in the position insertion operation.

(6) realize sort function, according to the total of three classes in order from high to low.

(7) statistics of the number of students.