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No! you cant do this.

Yes

pure virtual functions are there in the base class to make sure that the child classes override that(it gives a prototype that has to be implemented)...but here the object created is of base class(even though the the pointer is of child class)...which will give you a compile-time error if you call the pure virtual function...

With this assignment ,d is not complete and it over ridies the basic c++ type mechanism..compiler will throw an error "Invalid conversion from xx to yy". Though it is possible through dynamic_cast operator.