Database of data items mainly include: student id, name of data, grade, professional, 1, 2, 3, the average scores and grade. Request has the following features: (1) add, delete arbitrary a record. (2) modify any records. (3) show, keep records. (4) sorting function: open database, each student achievement and the average student with bubbles or overall, choose ranking will average scores and grade two new file after sorting from large to small (that), save the two files and records of all.

student5.cpp

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