第22章 继承和动态绑定
.....................\纯虚函数和抽象类
.....................\................\program.cpp
.....................\................\纯虚函数和抽象类.dsp
.....................\................\纯虚函数和抽象类.dsw
.....................\................\纯虚函数和抽象类.ncb
.....................\................\纯虚函数和抽象类.opt
.....................\................\纯虚函数和抽象类.plg
.....................\继承
.....................\....\DATE.CPP
.....................\....\DATE.H
.....................\....\Person.h
.....................\....\Program.cpp
.....................\....\specialperson.h
.....................\....\stringclass.cpp
.....................\....\stringclass.h
.....................\....\继承.dsp
.....................\....\继承.dsw
.....................\....\继承.ncb
.....................\....\继承.opt
.....................\....\继承.plg