在顺序文件“stud1.dat”中添加三个学生的学号（2008005～2008007），姓名和三门课成绩，然后读出全部记录，计算每个学生的总分和平均分，按总分从高到低将每个学生的学号、姓名、三门课成绩、总分和平均分写入顺序文件“stud2.dat”，同时在窗体上显示出来。

-In order paper " stud1.dat"　Students learn to add three numbers (2008005 ~ 2008007), name, and three class achievements, and then read all the records, calculate each student' s total score and average score, according to total score from high to low to each student' s student number, name, three-course results, the average points score and write sequential file " stud2.dat" , while the form is displayed.