Bad FP error with MS C++ compiler

[Adem24]

// MS-Bug # 999,995 (5 left for 1 million bugs :-) :

const double d = DBL_MIN;

double v00 = 0.0;
bool f00 = v00 d;

double v01 = 0.1;
bool f01 = v01 d;

gives wrongly 'false' for f00... :-)

[joseph cook]

On Jul 20, 10:49*am, "Adem24" <ade...@adem24. org.invalidwrot e:

Further analysis shows that *it has nothing todo with the DBL_MIN
but the value ZERO !
Ie. the MS compiler treats the value 0 not correctly in FP ops.

Woah! Slow down. Millions (Billions? Trillions?) of lines of code
have been written using Microsoft compilers. Think about the
likelyhood that you are the first person to have tried using "0" in a
FP operation, and then consider the possibility that the problems lies
on your end, not the compilers.

--JC

[James Kanze]

On Jul 21, 2:51 pm, Victor Bazarov <v.Abaza...@com Acast.netwrote:

Gennaro Prota wrote:

[..]
:-) Out of curiosity, is there really a bug count for VC++, somewhere?

There must be. Since you can add to the collection (and check
if your addition is in the collection), there must be a way to
obtain the size of the collection, right?

But what does it mean? Anyone who's worked in support at one
time or another knows that 90% of the complaints are user error
(like the one that started this thread). The fact that VC++ is
the most widely used compiler by beginners probably means that
it will get the most "bug reports": for some beginners (often
the most stupid), the problem is always the compiler, and not
their stupidity.

--
James Kanze (GABI Software) email:ja******* **@gmail.com
Conseils en informatique orientée objet/
Beratung in objektorientier ter Datenverarbeitu ng
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[Victor Bazarov]

James Kanze wrote:

On Jul 21, 2:51 pm, Victor Bazarov <v.Abaza...@com Acast.netwrote:

>Gennaro Prota wrote:

>>[..]
:-) Out of curiosity, is there really a bug count for VC++, somewhere?

>There must be. Since you can add to the collection (and check
if your addition is in the collection), there must be a way to
obtain the size of the collection, right?

But what does it mean? Anyone who's worked in support at one
time or another knows that 90% of the complaints are user error
(like the one that started this thread). The fact that VC++ is
the most widely used compiler by beginners probably means that
it will get the most "bug reports": for some beginners (often
the most stupid), the problem is always the compiler, and not
their stupidity.

Any product, especially as complex as a C++ compiler, contains errors
and misbehaviours, most of which are unintentional. *If* the product
manufacturer is interested in improving the product or at least their
image, they will be collecting the information on what seems to be wrong
with their product. Such information is often put in the form of a list
(of so called "bugs"). The list is finite, hence has a size. Some
manufacturers even make such lists public, many don't. Even if the list
is not public, it tends to have a size. That's what it means.

The suggestions or complaints are always verified against the product
specification, against common sense, product development schedules, etc.
If the suggestion is due to user error, it most likely will not be put
on the list of suggestions (although if it's an indication of a missing
feature or a possible work flow improvement, it might, indirectly). So,
the list of bugs most likely does not contain "bug reports" created due
to somebody's stupidity.

When I say "you can add to the collection" I don't mean "you can send an
e-mail about your problem". I mean you can cause the collection to grow
if your report is about a real defect in the product or contains a
genuine improvement suggestion.

V
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