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> (Of course, that assumes NULL is 0, but I don't think I've run into any
> architecture so braindead as to not have NULL=0.)

It has nothing to do with machine architecture. The C standard
says 0 coerces to the null pointer. NULL, defined in <stddef.h>,
is part of the library, not the language. I always use 0,
because NULL is a frill.

Doug