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no, you do not need getA() to be virtual unless you are overriding it in the derived class, you do need a virtual destructor though and int i does need to be const, but I guess that was not the point of this task anyways. The weird behavior you are seeing is because you are not dealing with array of pointers but with array of objects rather. What you are doing here is taking an array of the derived class objects and presenting it to the function, that operates on array of base class objects (not pointers to objects). The derived class is twice the size of the base class, therefore your pointer math will be off.
- voidarg December 17, 2016