The C99 standard forgot to define the printf equivalent for complex numbers
Since I am revising the lcc-win implementation of complex numbers
I decided to fill this hole with
"Z"
for instance
double _Complex m = 2+3*I;
printf("%Zg\n", m);
will print
2+3*I
The alternative flag makes this look like:
printf("%#Zg\n" ,m);
2.00000+3.00000 i
--
jacob navia
jacob at jacob point remcomp point fr
logiciels/informatique http://www.cs.virginia.edu/~lcc-win32 25  9728 
"jacob navia" <ja***@nospam.c omwrote in message
news:fq******** **@aioe.org...
The C99 standard forgot to define the printf equivalent for complex
numbers
Since I am revising the lcc-win implementation of complex numbers
I decided to fill this hole with
"Z"
for instance
double _Complex m = 2+3*I;
printf("%Zg\n", m);
will print
2+3*I
The alternative flag makes this look like:
printf("%#Zg\n" ,m);
2.00000+3.00000 i
I don't think it's quite like that, Jacob, much like the dinner I ingested
on the Champs d'Elyzee. Unlike those 6 chefs 2 dieners, who knew to feed my
wife excellent cuisine while they fed me a horse's willy that I either gave
to my shirt pocket or to the sidewalk on our way back to the hotel, I
actually expected a meal.
I'd be interested to try a new version of lcc.
--
Gerry Ford
"Er hat sich georgiert." Der Spiegel, 2008, sich auf Chimpy Eins komma null
beziehend.
In article <12************ **@news.newsgro ups.com>, "Gerry Ford" <in*****@invali d.netwrote:
>I don't think it's quite like that, Jacob, much like the dinner I ingested
on the Champs d'Elyzee. Unlike those 6 chefs 2 dieners, who knew to feed my
wife excellent cuisine while they fed me a horse's willy that I either gave
to my shirt pocket or to the sidewalk on our way back to the hotel, I
actually expected a meal.
In future, please sober up before posting. Thank you.
Gerry Ford wrote:
[bad dinner left a lasting impression]
Coming back to complex numbers... Any comments?
--
jacob navia
jacob at jacob point remcomp point fr
logiciels/informatique http://www.cs.virginia.edu/~lcc-win32
jacob navia wrote:
Gerry Ford wrote:
[bad dinner left a lasting impression]
Coming back to complex numbers... Any comments?
Would it give a diagnostic if called in conforming mode?
Bye, Jojo
jacob navia wrote:
Gerry Ford wrote:
[bad dinner left a lasting impression]
Coming back to complex numbers... Any comments?
You initial post sounded quite matter-of-factly and not like e request for
comments...
Joachim Schmitz wrote:
jacob navia wrote:
>Gerry Ford wrote:
[bad dinner left a lasting impression]
Coming back to complex numbers... Any comments?
You initial post sounded quite matter-of-factly and not like e request for
comments...
Excuse me. I should have request comments more explicitely.
I hope I do not mess something else. I used "Z" since in the lasts
discussions (about my "b" extension) people complained that it was a
lower case letter. Then I used now upper case ones.
--
jacob navia
jacob at jacob point remcomp point fr
logiciels/informatique http://www.cs.virginia.edu/~lcc-win32
Joachim Schmitz said:
jacob navia wrote:
>Gerry Ford wrote:
[bad dinner left a lasting impression]
Coming back to complex numbers... Any comments?
Would it give a diagnostic if called in conforming mode?
No diagnostic message is required for invalid format specifiers to printf.
The behaviour is undefined, and implementations can do anything they like
as a consequence. In lcc-win32, maybe the implementation will treat the
argument as a complex number. Perhaps under some other implementation
it'll format the hard disk. Life gets exciting when you allow your code to
rely on non-standard extensions and then re-compile the code in a
different environment.
I'm not quite sure why this thread is cross-posted to comp.lang.c - it
seems to be an entirely lcc-related subject.
--
Richard Heathfield <http://www.cpax.org.uk >
Email: -http://www. +rjh@
Google users: <http://www.cpax.org.uk/prg/writings/googly.php>
"Usenet is a strange place" - dmr 29 July 1999
On Fri, 29 Feb 2008 15:50:17 +0100, jacob navia wrote:
Gerry Ford wrote:
[bad dinner left a lasting impression]
Coming back to complex numbers... Any comments?
What about complex numbers?
--
Ioan - Ciprian Tandau
tandau _at_ freeshell _dot_ org (hope it's not too late)
(... and that it still works...)
On Fri, 29 Feb 2008 10:34:17 +0100, jacob navia wrote:
The C99 standard forgot to define the printf equivalent for complex
numbers
Since I am revising the lcc-win implementation of complex numbers I
decided to fill this hole with
"Z"
for instance
double _Complex m = 2+3*I;
printf("%Zg\n", m);
will print
2+3*I
The alternative flag makes this look like:
printf("%#Zg\n" ,m);
2.00000+3.00000 i
Is it worth doing this? I mean is there a good reason to make the
programmer remember an extra formatting option that's non standard
instead of allowing him to use what he already knows? I mean doing printf
("%f+%f*I\n",re al(m),imag(m)) is not that big of an effort, is it?
However, if you really want to have this formatting option it's probably
a good idea to talk to the guys in comp.std.c and see if they are
considering something like that and whether or not your implementation
may be affected by the standard in the future.
--
Ioan - Ciprian Tandau
tandau _at_ freeshell _dot_ org (hope it's not too late)
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