Re: [Boost-users] [lexical_cast] float-to-string rounding error (notfound with cout)

30 Apr 2009


      On Thu, Apr 30, 2009 at 1:57 PM, Dominique Devienne  wrote:
...
[DD] Rarely, not never ;-)
Never for people who do not know how it actually works internally :P
On Thu, Apr 30, 2009 at 1:57 PM, Dominique Devienne  wrote:
...
...
A more proper implementation would be:
bool FloatsEqual(float f1, float f2, float eps=0.00001)
{
   return eps>(f1-f2);
}
I'm no expert, but the above does not take into account the
"magnitude" of the numbers.
Comparing 0.000001 and 0.0000011 with 0.000001
and 999999.0 and 999999.1 with 0.00001 don't mean the same thing at all.
Which is why eps was a default value that can be overridden with
whatever might be good for the time.  And yea, forgot the absolute,
been a long day.  :)

Re: [Boost-users] [lexical_cast] float-to-string rounding error (notfound with cout)

OvermindDL1