定义一个基类有姓名、性别、年龄；再由基类派生出教师类和学生类，教师类增加工号、职称和工资，学生类增加学号、班级、专业和入学成绩；由学生类和教师类派生在职研究生类和在读教师类，在职研究生类增加工作单位。-Define a base class has a name, sex, age　then　the base class derived teacher class and student class, teacher class adds the job number, job title and salary, student class increase student number, class, professional and school achievement　student classes and teachers job postgraduate class and the derived class in the class of reading teachers, postgraduate class increase workplace.