说明：  用户通过选择功能界面，可以对学生成绩管理系统进行各种操作： 操作1：可增加学生信息，包括学生的学号、姓名，以及五科成绩。 操作2：进入删除界面，输入要输出的学生学号，即可删除该学生的所有信息。 操作3：进入查询界面，可通过选择"1"按学号查询，"2"按姓名查询，进行对某个学生进行查询，查询后显示该学生的所有信息。 操作4：进入修改界面，输入要修改的学生的学号，即可对所有信息进行修改，修改后将自动保存。 操作5：即可显示所有学生的所有信息。 操作6：分别显示所有科目的平均成绩 操作7：可以查询到各科成绩的最高分、总分均分最高分的分数及学生姓名。 操作8：可以查询到各科成绩的最低分、总分均分最低分的分数及学生姓名。 操作9：保存以上所进行的所有操作，并把操作后的数据写入磁盘。 操作10：退出学生成绩管理系统。
(User interface by selecting the functions, management of student performance on a variety of operating systems: Operation 1: increase the students, including students, school number, name, and five subjects. Operation 2: enter the delete interface, input to output its students, you can delete all the information the student. Operation 3: to enter the query interface by selecting "1" according to study its inquiries, "2" query by name, the students of a particular query, inquiry revealed that the students all the information. Operation 4: to enter the modified interface, you want to modify its students, you can modify all the information, will automatically save modified. Operation 5: to display all the information for all students. Operation 6: all subjects showed an average score Operation 7: You can query the various achievements of the highest points, the highest points total divided equally between the scores and student names. Operation 8: You can query the various)