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The sixth chapter of c + + training first design a person class person as the base class, whose data members are name and id number including data member address and age, member function has input data and display data; Generate the derived class student student, student, including the data member telephone number and c + + score, the member function has input data and display data; Design student score class score, which is the class of student and add class, inherits all the attributes of two classes, the score class itself has data members mathematical scores and English scores, member functions have input data and display data; The employee employee inherits the person class, with no member in the class. Write the main program to observe the results of the operation.