On Wed, 09 Feb 2011 20:54:41 +0100, Christian Sciberras said:
> $f=floatval("2.2250738585072011e-308");
> echo 'Try 2 => '.$f.'</br>';
> Plus, I'm a bit amazed such a bug exists in PHP - since converting to
> floating point is a trivial operation, it should have been limited and
> safe-guarded from the start.
Take a careful gander at that number, then go look at the floating point spec -
it's a specific corner case that isn't obviously trivial to get right (doing
floating point *right* is a lot harder than it looks - take a class on
numerical methods sometime, you spend 75% of your time dealing with rounding
errors in the last bit).
Having said that, anybody writing floating point support for a package should
probably google 'floating point paranoia' and learn what sort of things to test
for. :)
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