Unfortunately, most books simply vanish and/or have an unclear legal status.
# implied int; implied void
exit(0) # or EXIT_SUCCESS
Edit: And sure enough clang (by default) and gcc (with -Wall) both issue warnings.
(And there's also a PDF of all the pages, linked to from the gbdirect version, http://publications.gbdirect.co.uk/c_book/the_c_book.pdf ; for those of you having trouble with the printer-friendly version.)
/* ... */
In other places, it puts restrictions that are no longer relevant today. For example, since C99 (and most compilers allowed this long before C99) you can declare variables anywhere inside a block (which is pretty handy), and not just at the beginning of the function.
I say it a lot too, especially when talking about interfacing with external resources, and I don't think it's anything to do with enjoying others' misery. It's simply being happy to have it confirmed that the problem you're observing is (probably) someone else's fault, not your own; this carries the bad news that you (probably) can't fix it yourself, but the good news that you don't have to fix it yourself.