On Sun, Feb 20, 2011 at 9:26 PM, John Cowan <[email protected]> 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 <[email protected]> > Yakka foob mog. Grug pubbawup zink wattoom gazork. Chumble spuzz. > --Calvin, giving Newton's First Law "in his own words" > -- Cheers, --MarkM
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