The errata mentions several fixes, including adding the missing constructor, a delete statement to free the memory pointed to by pStack and a modification to the loop that pops CBox objects from the stack.

Ironically, the errata itself has an error in it's correction for this exercise. A long story short, save yourself some grief and grab the corrected source code from the 2010 edition of this book. Compare the two and you'll see how this should have been written.

If you try to compile the problem from the 2010 code for CStack with Visual studio 2008 you must add #define nullptr 0 before class CStack since nullptr was not a standard until 2009.