pure virtual function and abstract category. The VC a virtual function of the source, more suitable for beginners VC. After I uploaded a series of this type of source for all learning.

3.3.2纯虚函数和抽象类
.....................\Debug
.....................\纯虚函数和抽象.cpp
.....................\纯虚函数和抽象.dsp
.....................\纯虚函数和抽象.dsw
.....................\纯虚函数和抽象.ncb
.....................\纯虚函数和抽象.opt
.....................\纯虚函数和抽象.plg

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