实现学生宿舍信息的基本管理，采用了面向对象的思想，用到虚函数，多重继承，多态-achieving student hostels basic information management, the use of the object-oriented thinking, use virtual function, multiple inheritance, polymorphism

vc——实现C++类的多重继承\MultiInheritance-vc- C++ classes to achieve multiple inheritance \ MultiInheritance