There are four students in a class, each student has a student number, as well as mathematics, physics, English, Chinese, sports information 5 classes. Write the three functions respectively in order to achieve the following three requirements. (1) the mathematical average grades. (2) failed to have two or more classes of students, the output of their student id, each course result and grade point average. (3) the output result good student (grade point average in more than 85 points or all of the scores are more than 80 points) of the student number, each grades and gpa.

sy_1.c

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