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Lately I have been using header files to split up my program into separate files, (C files containing functions and header files declaring them). Every thing works fine but for some reason, I need to include <stdio.h> and <stdlib.h> in EVERY C file… or my project fails to compile. Is this expected behavior?
C modules need to know either how something is defined, or where it can find a definition. If the definition is in the header file, then you should include it in the modules that use it. Here is a link to information regarding header files.