Path: utzoo!attcan!uunet!lll-winken!ames!haven!uvaarpa!hudson!astsun1.acc.Virginia.EDU!gsh7w
From: gsh7w@astsun1.acc.Virginia.EDU (Greg Hennessy)
Newsgroups: comp.lang.c
Subject: Re: When is a cast not a cast?
Message-ID: <1513@hudson.acc.virginia.edu>
Date: 18 May 89 16:19:27 GMT
References: <406@skye.ed.ac.uk> <10276@smoke.BRL.MIL> <2890@buengc.BU.EDU> <334.nlhp3@oracle.nl>
Sender: news@hudson.acc.virginia.edu
Reply-To: gsh7w@astsun1.acc.Virginia.EDU.acc.Virginia.EDU (Greg Hennessy)
Organization: University of Virginia, Charlottesville
Lines: 23

In article <334.nlhp3@oracle.nl> bengsig@oracle.nl (Bjorn Engsig) writes:
#Pointer addition IS meaningless.  Let's take an example of a 3 bit machine
#with only 0, 1, 2, ... , 7 as the only addresses.  Let's also declare
#
#char *p, *q;
#
#and let p==3 and q==5.  Then what is p+q?  Which type does it have?  The
#presumed answer of '8' cannot be stored in this machine.
#

Then why can't one say "Integer addition IS meaningless. Let's take an
example of a 16 bit machine. Let's also declare

int i,j;

and let i == 32000 and q == 32767. Then what is I+j? Which type does
it have? The presumed answer of `64767' cannot be stored in this
machine. 

-Greg Hennessy, University of Virginia
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