What does the include in the middle of code in C?

Question

Please, could you tell me what does the code below do?

...code...
#include file.h
...code...

I was used to put includes a the beggining of

Answer 1

#include is a pre-processor directive that takes the file given as the argument and dumps its contents in the current file. Typically, this is used to include definitions of commons functions from header files, but there's no necessity to use it in that way.