1.通过键盘输入各学生的多门课程的成绩，建立相应的文件input.dat

2.对文件input.dat中的数据进行处理，要求具有如下功能：

a.按各门课程成绩排序，并生成相应的文件输出

b.计算每人的平均成绩，按平均成绩排序，并生成文件

c.求出各门课程的平均成绩、最高分、最低分、不及格人数、

60－69分人数、70－79分人数、80－89分人数、90分以上人数

d.根据姓名或学号查询某人的各门课成绩，重名也要能处理

3.界面美观

-1 keyboard input through the courses of each student s achievement, the establishment of the corresponding file input.dat

Treatment of 2 input.dat in file data requirements, has the following functions:

A. sorting according to each course grades, and generates the corresponding output file

Average B. score calculated per person, sorted by the average score, and generate a file

C. calculate the course grade point average, the highest score, the lowest score, do not pass the number,

6069 number, number, number of 8089 70-79, more than 90 the number of

D. according to the name or number of query sb each class performance, also want to be able to handle duplicate

3 beautiful interface