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From: Thomas 'PointedEars' Lahn <PointedEars@web.de>
Newsgroups: comp.lang.javascript
Subject: Re: IE and IEE 754
Date: Thu, 28 Aug 2014 12:21:21 +0200
Organization: PointedEars Software (PES)
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Evertjan. wrote:

> "Christoph M. Becker" <cmbecker69@arcor.de> wrote:
>> However, it seems to me that multiplying 123.45 (0x405edccccccccccd)
>> with 100 doesn't solve the issue, i.e. the result is not necessarily
>> equal to 12345 (0x40c81c8000000000).
> 
> No, as I said, it is the string that is <input>-ted,
> and that should be converted by string [regexed if you like] methods.
> 
> a = 123.45; // expecting 2 decimals, extra code needed if otherwise
> b = +a.split('.').join('');

There is no Number.prototype.split() by default.  You mean 
String.prototype.split():

  var b = a.toString().split('.').join('');

or (in this case equivalent)

  var b = String(a).split('.').join('');

but this does not solve the problem because it is based on the very same 
string representation of the Number value.

It can only be solved if you have string input in the first place, like from 
an HTML form:

  /* BTW see jsx.array.destructure() for an emulation of
     JavaScript 1.7’s Array destructuring */
  var parts = input.value.split('.');
  var int_part = parts[0];
  var frac_part = parts[1];

  var value = int_part * 100 + (+frac_part);

  /* calculate with value */

  var result = … / 100;

-- 
PointedEars
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