How many levels deep can include files be nested?

- As such, there is no limit to number of levels of nested include files you can have however your compiler might run out of stack space when trying to include an inordinately high number of files. This number rely on your compiler and hardware configuration.

- Although it's legal to nest include files yet you should avoid it. An include level must be created only where it's required and makes sense, like creating an include file which has a #include statement for every header required by the module you are working with.