There are many ways. You can #include "../stdafx.h", for instance. More common is to add the root of your project to the include path and use #include "shapes/sphere.h". Or have a separate directory with headers in include path.
There are many ways. You can #include "../stdafx.h", for instance. More common is to add the root of your project to the include path and use #include "shapes/sphere.h". Or have a separate directory with headers in include path.