文件名称:111
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声明一个车（vehicle）类，有Run、Stop等成员函数，由此派生出自行车（bicycle）类、汽车类（motorcar）类，
//从bicycle类和motorcar类派生出摩托车类（motorcycle）类，他们都有Run、Stop等成员函数。观察虚函数的作用-Declare a vehicle (vehicle) category, Run, Stop and other member functions, which derive the bike (bicycle), automobiles (motorcar) class,// derived from the bicycle class, and motorcar motorcycle class (motorcycle) class They have the Run, Stop and other member functions. Observe the role of the virtual function
//从bicycle类和motorcar类派生出摩托车类（motorcycle）类，他们都有Run、Stop等成员函数。观察虚函数的作用-Declare a vehicle (vehicle) category, Run, Stop and other member functions, which derive the bike (bicycle), automobiles (motorcar) class,// derived from the bicycle class, and motorcar motorcycle class (motorcycle) class They have the Run, Stop and other member functions. Observe the role of the virtual function
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虚函数.cpp