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From: phd_ivo@gsbacd.uchicago.edu
Newsgroups: gnu.gcc
Subject: IEEE FLP question: Use of NAN and Inf
Message-ID: <6788@tank.uchicago.edu>
Date: 18 Dec 89 22:59:10 GMT
Sender: news@tank.uchicago.edu
Lines: 25

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Can someone please tell me how to use the NAN
definition in math.h?

	double d;
	d=(double) NAN;
	printf("%d", d==(double) NAN);

prints 0 in NeXT version 16 (Gnu version 1.34).
What am I doing wrong?

Moreover, can someone please tell me how to define
the IEEE double's of +Inf, -Inf, and NaN, so that
I can assign and test for them?

Will standard operations like + or - generate an
exception if attempted on NaN? That would be useful
for debugging.

Help is appreciated.

/ivo