Header per source file

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The header files in C separate declarations (which must be available to each .c file that uses the functions) from the definitions (which must be in one place). Further, they provide a little modularity, since you can put only the public interface into a header file, and not mention functions and static variables that should be internal to the .c file. That uses the file system to provide a public interface and private implementation.

The practice of one .h file to one .c file is mostly convenience. That way, you know that the declarations are in the .h file, and the definitions in the corresponding .c file.

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