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Message from discussion Need some JavaScript puzzles
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Jorge  
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 More options Sep 30 2008, 3:39 pm
Newsgroups: comp.lang.javascript
From: Jorge <jo...@jorgechamorro.com>
Date: Tue, 30 Sep 2008 12:39:30 -0700 (PDT)
Local: Tues, Sep 30 2008 3:39 pm
Subject: Re: Need some JavaScript puzzles
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On Sep 29, 11:49 pm, Dr J R Stockton <J.R.Stock...@physics.org> wrote:

> On Sep 29, 9:02 pm, Jorge <jo...@jorgechamorro.com> wrote:

> > While writing 'my version', I was going to 'logically' test the bits
> > with an '&', but I have discovered that the & operator operates on
> > just 32 bits, not on the 53 available in the mantissa of a 'number'
> > primitive value:

> Agreed, but one can access all bits of a Double for logical operations
> by using arithmetic.  Working example :
> <URL:http://www.merlyn.demon.co.uk/js-misc0.htm#TC>

Yes, that's what I did, see:

function toBinaryString (number) {
  var weight= Math.pow(2, 52), binStr= '', decimalPoint;
  do {
    if (number >= weight) {
      number-= weight;
      binStr+= '1';
    } else { binStr+= binStr ? '0' : ''; }

    if (((weight/= 2) < 1) && !decimalPoint) {
        decimalPoint= 1;
        if (number) {
          binStr+= binStr ? '.' : '0.';
        } else { binStr+= binStr ? '' : '0'; }
    }
  } while (!decimalPoint || (number && weight))
  return binStr;

};

--
Jorge.

 
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