Article View: comp.std.c
Article #2605Re: Function Argument Evaluation
From: Chris Torek
Date: Wed, 27 Mar 1991 10:44
Date: Wed, 27 Mar 1991 10:44
19 lines
1354 bytes
1354 bytes
In article <17895@crdgw1.crd.ge.com> volpe@camelback.crd.ge.com
(Christopher R Volpe) writes:
>However, isn't this a moot point? The only time the value of 'expression'
>before assignment may NOT be equal to the value of 'lvalue' after
>assignment is in the case that 'lvalue' has its contents modified more
>than once between sequence points, in which case all bets are off.
No: one typical case is:
unsigned char c;
unsigned long l;
...
(void) printf("l=%lx c=%x\n", l, (c = l));
which (again, `typically') pushes `l' through a `character knothole'
and `scrapes off' the top bits.
--
In-Real-Life: Chris Torek, Lawrence Berkeley Lab CSE/EE (+1 415 486 5427)
Berkeley, CA Domain: torek@ee.lbl.gov
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<15552@smoke.brl.mil> <1991Mar23.014442.24307@cs.ucla.edu> <17868@crdgw1.crd.ge.com> <3216@charon.cwi.nl> <17895@crdgw1.crd.ge.com>Show Full Headers
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Path: arc1-ca.pugleaf.net!utzoo!utgpu!news-server.csri.toronto.edu!rpi!zaphod.mps.ohio-state.edu!rphroy!caen!uwm.edu!linac!att!ucbvax!dog.ee.lbl.gov!elf.ee.lbl.gov!torek From: torek@elf.ee.lbl.gov (Chris Torek) Newsgroups: comp.std.c Subject: Re: Function Argument Evaluation Message-ID: <11512@dog.ee.lbl.gov> Date: 27 Mar 91 10:44:20 GMT References: <15552@smoke.brl.mil> <1991Mar23.014442.24307@cs.ucla.edu> <17868@crdgw1.crd.ge.com> <3216@charon.cwi.nl> <17895@crdgw1.crd.ge.com> Reply-To: torek@elf.ee.lbl.gov (Chris Torek) Organization: Lawrence Berkeley Laboratory, Berkeley Lines: 19 X-Local-Date: Wed, 27 Mar 91 02:44:20 PST