How is dynamic polymorphism achieved?
What does dynamic polymorphism refer to? ——Also known as runtime polymorphism, it means that the member function of which class is called this time is determined when the program is running.
How to implement dynamic polymorphism——
(1) The base class declares those subclasses that will have their own versions of member functions as virtual functions;
(2) The subclass redefines the virtual function declared by the base class;
(3) In the application, use the base class pointer (or reference) to point to the object of the relevant class, and use the pointer (or reference) to call the member function.
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