How to structure #includes in C

Question

Say I have a C program which is broken to a set of *.c and *.h files. If code from one file uses functions from another file, where should I include the header file? Inside

Answer 1

I would only include header files in a *.h file that required for the header file itself. Header files that are needed for a source file, in my opinion, should be included in the source file so that the dependencies are obvious from the source. Header files should be be built to handle multiple inclusion so you could put it in both if required for clarity.