Basic C bug

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Article #11999

#11999

From: Peter Rowat
Date: Fri, 21 Apr 1989 02:12

27 lines
1373 bytes

We're using a 386i, sunos4.0.0 The "cc" compiler produces ****WRONG****
code when you mix function calls and arithmetic expressions. The following
is perhaps the simplest example:

============================================================
double one() {return 1.0;}
main()
{	printf("Bug? %lf \n", one() / ( one() +  2.0)); }
============================================================

		produces 

=======================================================
Bug? Inf 
=======================================================

	The output should, of course, be: 

=======================================================
Bug? 0.33333333
=======================================================

	So,don't trust cc! The GNU C works perfectly (so far).
	Peter Rowat.

[[ The example works correctly on a 3/60 running SunOS 4.0.1.  Have you
tried it under 4.0.1?  --wnl ]]

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Path: arc1-ca.pugleaf.net!utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!cornell!uw-beaver!rice!sun-spots-request
From: peter%crayfish@ucsd.edu (Peter Rowat)
Newsgroups: comp.sys.sun
Subject: Basic C bug
Keywords: 386i
Message-ID: <8903190423.AA04698@crayfish.ucsd.edu>
Date: 21 Apr 89 02:12:03 GMT
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Organization: Sun-Spots
Lines: 27
Approved: Sun-Spots@rice.edu
Original-Date: Sat, 18 Mar 89 20:23:14 PST
X-Sun-Spots-Digest: Volume 7, Issue 232, message 12 of 21