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From: "Christoph M. Becker" <cmbecker69@arcor.de>
Newsgroups: comp.lang.javascript
Subject: Re: Date arithmetic
Date: Thu, 20 Nov 2014 00:47:13 +0100
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Ben Bacarisse wrote:

> Tim Streater <timstreater@greenbee.net> writes:
> 
>> In article <877fyr3sxr.fsf@bsb.me.uk>, Ben Bacarisse
>> <ben.usenet@bsb.me.uk> wrote:
>>
>>> ECMAScript does not have a separate integer type.  You can represent any
>>> integer in (2^53, 2^53) exactly (and zero twice!) using the built-in
>>> Number type, but you are still using a floating point type as far as the
>>> language definition goes.
>>
>> Why twice? is the javascript VM a ones-complement machine?
> 
> I'm talking about what the recent (5.1) language standard says.  The
> Number type uses the IEEE 754 64-bit floating point format in which (to
> quote) "there is both a positive zero and a negative zero" but you have
> to work hard to find out which one you have!

To be precise, the IEEE 754 double-precision 64-bit *binary* format. :)

-- 
Christoph M. Becker