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From: lvc@cbnews.ATT.COM (Lawrence V. Cipriani)
Newsgroups: comp.lang.c
Subject: Yet another pcc botch
Keywords: Compiler bugs
Message-ID: <3310@cbnews.ATT.COM>
Date: 20 Jan 89 13:32:29 GMT
Organization: AT&T Bell Laboratories
Lines: 31

This program demonstrates a bug that is in some versions of pcc:

main()
{
	float f, g;
	unsigned short u, v;
	short s, t;

	u = 250;
	s = 250;

	t = 100;
	v = 100;

	f = t - s;
	g = v - u;

	printf("f = %f, g = %f\n", f, g);
}

When compiled and executed the output is:

f = -150.000000, g = 65386.000000

The correct value for g is -150.000000.  This bug is *not* present
in the cc that comes with SVR3 from AT&T.  It is present in SVR2 for
VAX and 3B20.
-- 

Larry Cipriani, AT&T Network Systems, Columbus OH,
Path: att!cbnews!lvc    Domain: lvc@cbnews.ATT.COM