建立一个小型的学生成绩管理系统，该系统具有输入、查询、修改、打印功能

1.　　建立一个学生数据文件stu.txt，每位学生数据中包含学号、姓名、性别、年龄、五门课的成绩。要求不少于16人

2.　　能根据学号查询任一学生某门课成绩或所有课程成绩。

3.　　系统界面设计

4.　　能修改学生的任何一个数据，并设置相应的修改口令

5.　　能按总成绩从高到低显示所有学生数据（分屏），包括每个学生的平均分，并输出到文件ou5.txt

-Establishment of a small student performance management system, the system has input, query, modify, and print functions

(1) the establishment of a student data file stu.txt contains the results of Student ID, name, gender, age, five courses of each student data. Requirements of at least 16 people

According to student number for any student in a course score or course grade.

(3) system interface design

Be able to modify any of the students　data, and set the corresponding change your password

(5) total score from highest to lowest display all student data (split screen), including the average score of each student, and output to a file ou5.txt