I've written a simple void function that merely displays a string, and registered it with atexit().
This function is called regardless of whether I end main() with exit() or return().
Are these statements then identical when used in main()?
According to documentation, exit() closes all open files.
If exit() always executes, is there any point in explicitly closing files at the end of the program?
Originally Posted by C17 Clause 5.1.2.2.3 Paragraph 1
Yes. You make it clear that these files were open and hence should be closed, which then avoids leaving them open unnecessarily should more code be later added to the program.
Of course, if this is a trivial one-off program, then there's no point, but such programs when written by experienced programmers can freely break all the rules of good practice as they deem fit.
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