LOG10E mystery constant

Mark S. Miller erights at google.com
Sun Feb 20 22:04:52 PST 2011


That's what I needed. Thanks.

On Sun, Feb 20, 2011 at 9:53 PM, Rico Wind <ricow at google.com> wrote:

> This was recently fixed in V8, see:
> http://code.google.com/p/chromium/issues/detail?id=72555
>
> Cheers,
> Rico
> On Feb 21, 2011 6:47 AM, "Mark S. Miller" <erights at google.com> wrote:
> > On Sun, Feb 20, 2011 at 9:26 PM, John Cowan <cowan at mercury.ccil.org>
> wrote:
> >
> >> Mark S. Miller scripsit:
> >>
> >> > This is the only constant whose actual value differs across browsers:
> >> >
> >> > 0.43429448190325176 v8 version 2.3.9 [console: dumb]
> >> > 0.4342944819032518 Chrome 11.0.672.2 dev
> >>
> >> [etc.]
> >>
> >> The two values are really the same value when represented as an IEEE
> >> double. The difference is in the printing routine, not the internal
> >> representation. Specifically, the "...2518" browsers are rounding, the
> >> "...25176" browsers are not.
> >>
> >
> > But they convert to back to two different floating point numbers, at
> least
> > on all the browsers I quickly tried.
> >
> >> 0.43429448190325176 === 0.4342944819032518
> > false
> >> 0.43429448190325176 < 0.4342944819032518
> > true
> >> 0.43429448190325176 > 0.4342944819032518
> > false
> >
> > A little more testing reveals that the two numbers seem to be
> consecutive,
> > in the sense that there are no intermediate representable numbers.
> >
> >
> >>
> >> "Floating-point numbers are a little like sandpiles; every time you pick
> >> one up, you get a little less sand and a little more dirt." (But this
> >> is not true of integers up to 2^53, slightly less than 10^16.
> >>
> >> --
> >> John Cowan <cowan at ccil.org>
> >> Yakka foob mog. Grug pubbawup zink wattoom gazork. Chumble spuzz.
> >> --Calvin, giving Newton's First Law "in his own words"
> >>
> >
> >
> >
> > --
> > Cheers,
> > --MarkM
>



-- 
    Cheers,
    --MarkM
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