Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!wuarchive!uunet!hbiso!cysog!drt
From: drt@cysog.UUCP (David R. Trinidad)
Newsgroups: comp.std.c
Subject: Greenhills "C" compiler (casting int's)
Summary: Question on the casing of int's
Keywords: int unsigned standard "C"
Message-ID: <510@cysog.UUCP>
Date: 5 Jun 91 21:21:46 GMT
Organization: CyCare Systems Inc.,  Phoenix,AZ
Lines: 37


1. I just received a reply from the Greenhills people on the
following code .. which compiles and runs correctly on AT&T,
mircosoft, borland and SCO:

#include <stdio.h>
#include <limits.h>
int intermediate = 100;
main()
{
	if (intermediate > USI_MAX -1 ) printf("this is a bug");
	if ((unsigned)intermediate > USI_MAX -1 ) printf("this works");
}

2. The response from GREENHILLS:
If a operand is unsined int , the second is converted in unsigned
int (sic).
If an operand is int the second is converted in int (signed)
[(sic)]
To get a correct value you must cast the first value to unsigned.

3. AT&T .... promotes the first value to unsigned if the second
operator is unsigned therfore correctly comparing the if
statment.

4. The question is : What is the standard ? K+R, and ANSI
Direct answers to either this posting or preferably E-MAIL
below.

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