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Polymorphism and virtual functions 1. To prepare a selection of outstanding teachers and students of the procedures, standards of outstanding teachers is a year more than three papers, the best students to the examination of the standard is an average score of 90 points or more, when the importation of a wide range of teachers and students, the list of outstanding teachers and lists of students. Experimental principle: to design a base class, which includes description of the data member name, to determine whether the best pure virtual function resulting derived category of teachers and students in class, teacher class paper added that the number of data members, heavy-duty to determine whether the outstanding member functions, the students added that the average class performance data member, heavy-duty members to determine whether the excellent function.