A virtual function in the base class does not override the derived function if the derived function exists, unless the call is ambiguous. A pure virtual function requires overriding in the derived class.
An overloaded operator may give the operator another meaning (as in output versus shift), or it may have the same meaning (add, say) with the operation merely modified. Adding integers is not done in the same way as adding (concatenating) strings.
Last edited by DaWei; 22Mar2007 at 16:26..