编程计算每个学生4门课成绩的平均分，将学生各科成绩及平均分输出大文件student.txt中，然后再从文件中读出，显示到屏幕上。-Program to calculate each student' s average score 4 subjects, the student and the average score of all subjects student.txt large files in the output, and then read from the file is displayed on the screen.