首先设计一个人员类person作为基类，其数据成员为姓名和身份号,

成员函数有输入数据和显示数据；生成person的派生类学生student,

student的数据成员为 电话号和C++成绩，成员函数也是有输入数据和显示数据；

要求大家用三种继承类型分别去实现。（不使用构造函数）

-First to design a staff class of person as the base class data member name and identification number,

　 Member function of the input data and display data　generate person derived class students student,

　 data member of the student s phone number and C++ results, the member function is the input data and display data

　 To achieve three types of inheritance, respectively. (Do not use the constructor)