Title: There are five students, there are three courses each student achievements, student data from the keyboard input (including the student number, name, 3 course grade), calculate the average score, the original data and calculated the average scores stored in the disk file " stud" in the. Stud read the contents of the file, sort by average processing student data will be sorted into a new file " stud_sort" in.

说明.txt
student.cpp

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