说明：  编制一个统计存储在文件中的学生考试分数的管理程序。设学生成绩以学生记录的形式存储的文件中，每个学生记录包含的信息有姓名、学号和各门功课的成绩。 要求编制具有以下几项功能的程序： （1）求出各门课程的总分，平均分； （2）按姓名，按学号寻找其记录并显示，浏览全部学生成绩和按总分由高到低显示学生信息等。
(Develop a management program of students' examination scores stored in files. In the file that students' grades are stored in the form of student records, the information contained in each student record includes name, student number and grades of each course. A program with the following functions is required: (1) Calculate the total score and average score of each course. (2) Search and display the records by name and student number, browse all students' scores and display students' information from high to low according to the total score)