学生成绩管理系统，每个学生的数据包含学号（不重复）、姓名、三门课的成绩及平均成绩。具体包含

1、成绩文件：成绩文件包括两个部分，即读取成绩记录文件和创建成绩记录文件；成绩管理：具有对成绩记录的添加、删除、单科排序操作；

2、成绩管理：具有对成绩记录的添加、删除、单科排序操作；

3、成绩查询：按学号查询学生记录；

4、成绩统计：根据学生的平均分高低，对学生的数据进行排序后输出；

5、退出系统：退出管理系统，回到DOS 命令符状态-Student achievement management system, each student s data contains student id (don t repeat), name, three classes of grades and gpa. Concrete containing

1, the result file: result file contains two parts, namely to read the record and create the record file　Performance management: to record to add, delete, meet a sorting operation

2, performance management: to record to add, delete, meet a sorting operation

3, scores query: according to the student number query student record

4, performance statistics: according to the student s average height, sorted output data to the student

5, exit system: exit management system, back to DOS commands