13365 Programming > C++

I am attempting to complete Assignemt Exercise 13.12 in the Deitel&Deitel 5th edition version of C++ How to program. I am running into some early errors in trying to incorporate the Date class into the existing Employee inherited class heirarchy. One issue is that I'm getting erros in the dervied classes that there are virtual functions in derived classes that have non-virtual destructors. I'm not sure what is going on at this point.