数据库的数据项主要数据包括：学号、姓名、年级、专业、成绩a、成绩b、成绩c、平均成绩、总成绩。要求具有以下功能：

（1）系统以菜单方式工作。

（2）显示、保存记录；添加、删除、修改任意多个记录。　　

（3）排序功能：打开学生数据库，计算每个学生的平均成绩和总成绩，用冒泡法或选择排序法将平均成绩和总成绩排序后，生成两个新文件（从大到小），存盘并显示这两个文件的全部记录。

（4）查询功能：打开总成绩排序文件，用折半查找法统计出给定分数的人数并显示。并能按学号或姓名查找并显示某个学生的各科成绩。

（5）统计功能：对各科成绩统计分析（平均分、最高分、最低分、及格率等）；统计各科各分数段人数。

-Main data database data items include: Student ID, name, grade, professional, results a, result b, result c, grade point average with a total score. Request has the following features:

(1) system to work the way the menu. 　

(2) shows that record-keeping　add, delete, modify any number of records.

(3) Sequencing: Open the student database, to calculate each student s grade point average and the total score, using bubble sort method or choose law will grade point average and the total results after sorting to generate two new files (descending), Save and display all the records of these two documents.

(4) query function: to open a total score sort files, use binary search method the statistics of the number of points given and displayed. And according to school to find and display the number or names of the subjects a student performance.

(5) statistical functions: statistical analysis of results of all subjects (average score, highest score, lowest score, pass rate, etc