#if query

[cepek at vixvax.mgi.com]

Does ANSI really state that

       #if ABC == DEF

evaluates to FALSE if symbol DEF is not defined!?

If so, I'm disappointed, since  #ifdef  and  #if defined  already
provide that functionality.

If not, I'd appreciate the reference in the spec.  (Neither of my
references [K&R II, Kochan] address this issue directly.)

Thanks in advance.

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