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From: Dr J R Stockton on 12 Aug 2010 14:32
In comp.lang.javascript message <e569280f-ff26-4817-b5b8-c12ecf98107b(a)q2
2g2000yqm.googlegroups.com>, Wed, 11 Aug 2010 10:59:23, Mike Ratcliffe
<michael(a)ratcliffefamily.org> posted:

>I realize that numeric accuracy is not perfect in JS but from what I
>have read in the FAQ etc. it seems that the number 632769996261406250
>should be easily handled by JavaScript.
>
>The following:
>alert(632769996261406250)
>
>Displays 632769996261406200 ... does anybody know why?

Yes. Convert your number to binary, getting
+100011001000000011001111010110000011101011111011011000101010
which is 60 bits long. Disregard trailing zeroes, and you have 59 bits
of resolution; a JavaScript Number, which is an IEEE Double, can hold
only 53 significant bits of resolution.

More about Numbers, etc., via sig below.

--
(c) John Stockton, nr London UK. ?@merlyn.demon.co.uk IE8 FF3 Op10 Sf4 Cr4
news:comp.lang.javascript FAQ <URL:http://www.jibbering.com/faq/index.html>.
<URL:http://www.merlyn.demon.co.uk/js-index.htm> jscr maths, dates, sources.
<URL:http://www.merlyn.demon.co.uk/> TP/BP/Delphi/jscr/&c, FAQ items, links.
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