（1）能按学期、按班级完成对学生成绩的录入。

（2）能按班级统计学生的成绩，求学生的总分及平均分，并能根据学生的平均成绩进行排序

（3）能查询学生成绩，不及格科目及学生名单

（4）能按班级输出学生的成绩单

（5）能按学号删除学生纪录，成绩等。

（6）将学生的学号、姓名及各门课程的成绩等信息保存于外部存储器的文件中。

-(1) semester, the class to complete the entry of student achievement. (2) total score and the average class statistics student achievement, seeking students, and according to the average score of the students to sort (3) to check student achievement, failing subjects and the list of students (4) can be output according to the class student' s transcr ipt (5) Student ID to delete a student record results. (6) the student' s student number, name and course performance information stored in external memory file.