Description: 1, the shape (a) write C++ program performs the following functions: (1) declare a base class Shape (shape), which contains a method to calculate the area (2) Shape derived two classes: Class rectangles and circles class (3) a class derived a rectangular square class (4) respectively, to achieve a derived class constructors, destructors and other methods (5) create a derived class object, observe the constructor, destructor calls the order (tips and requirements : 1, can be observed by the addition of related calls output message in the constructor and destructor function you can use the system (" pause" ) to pause the program 2, able to understand and explain every constructor and destructor function call is call which object and observe and explain its reasons for the order-related calls) (6) to calculate the area of different objects
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111.cpp
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