(1)每一条记录包括一个学生的学号、姓名、3门成绩、平均成绩。

(2)输入功能：可以一次完成无数条记录的输入。

(3)显示功能：完成全部学生记录的显示。

(4)查找功能：完成按姓名查找学生记录，并显示。

(5)排序功能：按学生平均成绩进行排序（从高到低）。

(6)插入功能：按平均成绩高低插入一条学生记录。

(7)保存功能：将学生记录保存在任何自定义的文件中，如保存在：d:\student.txt。

(8)读取功能：将保存在文件中的学生记录读取出来。

(9)有一个清晰美观界面来调用各个功能

-(1) Each record consists of a student' s student number, name, three scores, grade point average. (2) input: can be a complete record of myriad inputs. (3) display: the completion of all student records show. (4) search function: search by name complete student records, and displays. (5) sorting: sort by student grade point average (high to low). (6) insertion: insert an average performance level of student records. (7) saving features: student records will be kept in any custom files, such as the preservation: d: \ student.txt. (8) read function: the preservation of student records in a file read out. (9) has a clear and beautiful interface to call various functions