/in/ex5.cpp: In member function 'void bookInventory::removeBook(int)':
/in/ex5.cpp:24:22: error: comparison between signed and unsigned integer expressions [-Werror=sign-compare]
     if (ID < 1 || ID > numBooks)
                   ~~~^~~~~~~~~~
/in/ex5.cpp:26:28: error: comparison between signed and unsigned integer expressions [-Werror=sign-compare]
     for (int i = ID - 1; i < numBooks - 1; ++i)
                          ~~^~~~~~~~~~~~~~
/in/ex5.cpp: In member function 'void bookInventory::printInventory() const':
/in/ex5.cpp:34:23: error: comparison between signed and unsigned integer expressions [-Werror=sign-compare]
     for (int i = 0; i < numBooks; ++i)
                     ~~^~~~~~~~~~
/in/ex5.cpp: In member function 'bool bookInventory::repOK()':
/in/ex5.cpp:42:23: error: comparison between signed and unsigned integer expressions [-Werror=sign-compare]
     for (int i = 0; i < numBooks; ++i)
                     ~~^~~~~~~~~~
/in/ex5.cpp:45:30: error: comparison between signed and unsigned integer expressions [-Werror=sign-compare]
     for (int i = numBooks; i < size; ++i)
                            ~~^~~~~~
cc1plus: all warnings being treated as errors
/in/compile/Makefile:26: recipe for target 'ex5.o' failed
make: *** [ex5.o] Error 1