Hi,
For portability, can an issue arise if we use while(1) for an infinite
loop in C? If so, should we then use for(;;)? Thanks,
Rick
52  21913 
In article <3f********@cla rion.carno.net. au>, Rick wrote: Hi,
For portability, can an issue arise if we use while(1) for an infinite
loop in C? If so, should we then use for(;;)? Thanks,
Some C compilers may generate slightly different machine code,
but they ought to always be functionally identical. Choosing
one instead of the other will not break a program or make it
unportable.
--
Andreas Kähäri
"Rick" <rrquick@nosp am-com> wrote in message
news:3f******** @clarion.carno. net.au... Hi,
For portability, can an issue arise if we use while(1) for an infinite
loop in C?
No.
If so, should we then use for(;;)? Thanks,
You use for(;;) when you do not want to imply a test, otherwise for that
purpose, you use while(1)
The practical result will be the same for all but the very stupidest
compilers.
Rick
Rick wrote:
Hi,
For portability, can an issue arise if we use while(1)
for an infinite loop in C?
My compiler generates a warning for that kind of code,
when I have the warning level high, where I like it.
If so, should we then use for(;;)?
My compiler doesn't generate a warning for that code,
so that's what I use.
--
pete
"Rick" <rrquick@nosp am-com> wrote in message
news:3f******** @clarion.carno. net.au...
| For portability, can an issue arise if we use while(1) for an infinite
| loop in C? If so, should we then use for(;;)? Thanks,
It should come down to the same.
However, I use for(;;) because I use some compilers which send out
warnings of the kind: "Constant used as conditional expression".
go figure...
-- http://ivan.vecerina.com
Rick wrote: For portability, can an issue arise if we use while(1) for an infinite
loop in C? If so, should we then use for(;;)? Thanks,
There aren't any real portability issues, but the `1' seems too
arbitrary to me (as pointed out in <news:sl******* *********@ashi. FootPrints.net> ,
which is where I first saw that objection, I think. Using `true'
seems less objectionable, somehow, if you have a C99 (or C++) compiler
(or define it yourself).
Jeremy.
Greetings.
In article <bl************ @ID-114079.news.uni-berlin.de>, Jeremy Yallop
wrote: For portability, can an issue arise if we use while(1) for an infinite
loop in C? If so, should we then use for(;;)? Thanks,
There aren't any real portability issues, but the `1' seems too
arbitrary to me
More so than while(42)? There's plenty of precedent for using '1' as a
generic truth constant; less so for other nonzero numbers.
--
_
_V.-o Tristan Miller [en,(fr,de,ia)] >< Space is limited
/ |`-' -=-=-=-=-=-=-=-=-=-=-=-=-=-=-= <> In a haiku, so it's hard
(7_\\ http://www.nothingisreal.com/ >< To finish what you
Jeremy Yallop writes: For portability, can an issue arise if we use while(1) for an infinite
loop in C? If so, should we then use for(;;)? Thanks,
There aren't any real portability issues, but the `1' seems too
arbitrary to me (as pointed out in
<news:sl******* *********@ashi. FootPrints.net> , which is where I first saw that objection, I think. Using `true'
seems less objectionable, somehow, if you have a C99 (or C++) compiler
(or define it yourself).
I wouldn't expect *any* constant to get rid of the warning message. while
implies a condition that will vary. I can see the reason for the message
but I'm glad the compiler I have doesn't issue such a warning. I much
prefer the while(1) construct. The for(:::) looks to me like someone is
trying to impress someone with their arcane knowledge.
Rick wrote: Hi,
For portability, can an issue arise if we use while(1) for an infinite
loop in C? If so, should we then use for(;;)? Thanks,
Rick
Well using it directly in code it has no matter, but what about this:
#define forever for(;;)
do
{
...x...
} forever;
NR
> Jeremy Yallop writes: I wouldn't expect *any* constant to get rid of the warning message.
Wasn't that what Ivan said.. the compiler issues a "Constant used as
conditional expression" warning. How will *any* constant get rid of the
warning when the warning is about the use of a constant itself?
I much prefer the while(1) construct. The for(:::) looks to me like someone is
trying to impress someone with their arcane knowledge.
I don't think it's about making impressions, I'd say it's a matter of
taste. I myself use for(;;).. I believe it's much clearer to what's
happening; and like you said "while implies a condition that will vary",
that's just why while(constant) can be a little misleading at first
glance. My compiler once gave me a warning for while(constant) , I
wondered if using such a constract was non-portable, but that's clearly
not the case.
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