From kde-devel  Wed Apr 26 20:03:13 2006
From: Dmitry Suzdalev <dimsuz () gmail ! com>
Date: Wed, 26 Apr 2006 20:03:13 +0000
To: kde-devel
Subject: [OFFTOPIC] std::numeric_limits<double>::min() question.
Message-Id: <200604270003.13980.dimsuz () gmail ! com>
X-MARC-Message: https://marc.info/?l=kde-devel&m=114608188806431

Hello!

Please, sorry for offtopic, I write here in hope that this question will be 
quickly answered as it seems to be simple (and I lack some knowledge).

I have a C++ code like this:

double d = 0;
double maxd = std::numeric_limits<double>::min();
....
while(...)
{
     d = ....;
     if( d > maxd)
    {
        maxd = d;
        .....
    }
}

I.e., i want 'if' to _always_ evaluate to true on _first_ iteration.
But it doesn't work!
Gdb shows me that after initialisation 'maxd' is a _positive_ (and of course 
huge) value!
Isn't it meant to be negative (despite of how it's internally stored in 
"internals")? :)

Note, that if I change the second line to

double maxd = - std::numeric_limits<double>::max();

then all works as I expect!
But I'd rather do without such tricks and write the code that's straitforward 
and less messy ;).

What am I getting wrong?
Thanks in advance! :)

Dmitry.
 
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