/in/ex5.cpp: In member function 'void bookInventory::addBook(const Book&)':
/in/ex5.cpp:41:17: error: comparison between signed and unsigned integer expressions [-Werror=sign-compare]
     if(numbooks < getSize()){
        ~~~~~~~~~^~~~~~~~~~~
cc1plus: all warnings being treated as errors
/in/compile/Makefile:26: recipe for target 'ex5.o' failed
make: *** [ex5.o] Error 1