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finite() in ANSI C?

When I compile with the -ansi option (using gcc 3.2.3) I'm warned of an
implicit declaration of function 'finite'. Does this mean that finite() is
not part of ANSI C, or that I didn't include a necessary header file? (I
did include math.h.) Either way, is there a recommended way to check if a
float or double is finite in ANSI C? Thanks.
Nov 14 '05
11 14201
Da*****@cern.ch (Dan Pop) wrote:
In <3v************ *************** *****@4ax.com> Irrwahn Grausewitz <ir*******@free net.de> writes:
Smells like a broken (read: incomplete) library implementation.
Merely like an implementation that doesn't claim C99 conformance.


An incomplete library implementation implies non-conformance (for a
hosted implementation, that is). I did not feel compelled to point
that out explicitly.
<OT> It works correctly with the mingw port of gcc 3.3.1. </OT>


<still OT>
I doubt that the mingw port of gcc 3.3.1 comes with conforming C99
libraries.
Nobody claimed that it does. The isfinite macro however /is/
implemented, and AFAICT it works correctly. Alas, it's entirely
possible that I can't tell far enough.
So, your example is not only off topic, but also irrelevant.


Off topic contributions are irrelevant per definitionem.

Regards
--
Irrwahn Grausewitz (ir*******@free net.de)
welcome to clc: http://www.ungerhu.com/jxh/clc.welcome.txt
clc faq-list : http://www.faqs.org/faqs/C-faq/faq/
clc OT guide : http://benpfaff.org/writings/clc/off-topic.html
Nov 14 '05 #11
In <vj************ *************** *****@4ax.com> Irrwahn Grausewitz <ir*******@free net.de> writes:
Da*****@cern.c h (Dan Pop) wrote:
In <3v************ *************** *****@4ax.com> Irrwahn Grausewitz <ir*******@free net.de> writes:

So, your example is not only off topic, but also irrelevant.


Off topic contributions are irrelevant per definitionem.


If they were, most people wouldn't make them in the first place. They
might be irrelevant to the topic of the newsgroup, but they are supposed
to be relevant to the actual discussion. Consider, for example, people
posting the diagnostics generated by one compiler or another when
translating the code being discussed. Or descriptions of how a certain
(real or hypothetical) implementation would handle a certain code
snippet.

Dan
--
Dan Pop
DESY Zeuthen, RZ group
Email: Da*****@ifh.de
Nov 14 '05 #12

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