This is in regards to the sample exercise Ex8_12, "Try It Out - A Multifile Project Using the CBox Class", pages 400-12. I have followed the textbook instructions multiple times (recreated the entire program several times), researched the forums, as well as researched for additional update revisions, but have yet to find a solution for solving the following programming error:

1>Ex8_12.obj : error LNK2019: unresolved external symbol "public: int __thiscall CBox::operator/(class CBox const &)const " (??KCBox@@QBEHABV0@@Z) referenced in function "double __cdecl operator%(class CBox const &,class CBox const &)" (??L@YANABVCBox@@0@Z)

Please help, thank you.

The problem occurred because I forgot to add the multiply and division operator functions previously presented in the chapter. There was also a declaration from int to double for the division operation. Works perfect now!