Subj : Re: js_NumberToString asserting
To   : Gappodi <gappodi@hotmail.com>
From : Brendan Eich <brendan@meer.net>
Date : Fri Mar 19 2004 05:07 pm

Gappodi wrote:
> Brendan,
> 
> Sorry, there should have been an "e" in the number
> 
> js> var i=7.551073205401564445536e-06
> js> print (i)
> Assertion failure: numEnd < buffer + bufferSize, at jsdtoa.c:2578
> Aborted
> 
> It went away after changing ( in jsdtoa.h )
> #define DTOSTR_STANDARD_BUFFER_SIZE 26
> 
> It was 25 earlier.
> 
> I am not sure if this is the right thing to do.

You're using extremely out of date sources.  This bug, 
http://bugzilla.mozilla.org/show_bug.cgi?id=174555, was reported 
2002-10-15 07:01 PST and fixed 2002-10-18.

/be


> 
> Tks & Regds
> GP
> 
> 
> Brendan Eich <brendan@meer.net> wrote in message news:<405A8B54.5060403@meer.net>...
> 
>>Gappodi wrote:
>>
>>>With a numeric value like this the engine asserts while trying to js_NumberToString.
>>>
>>>var i = 7.1073205401563615-06;
>>>
>>>print ( i );
>>
>>I get no such assertion:
>>
>>js> var i = 7.1073205401563615-06;
>>js>
>>js> print ( i );
>>1.107320540156362
>>js> print ( i.toFixed(15) );
>>1.107320540156362
>>js> print ( i.toFixed(16) );
>>1.1073205401563619
>>js> print ( i.toFixed(17) );
>>1.10732054015636194
>>js> print ( i.toFixed(18) );
>>1.107320540156361943
>>js> print ( i.toFixed(19) );
>>1.1073205401563619432
>>js> print ( i.toFixed(20) );
>>1.10732054015636194322
>>
>>
>>>Anything that can be done to increase the precision?
>>
>>No, JS per ECMA-262 uses IEEE 754 double precision.  Note that toFixed 
>>can be used to show more or fewer digits, but the rounding error caused 
>>by the number format's precision limit is still there.
>>
>>/be

.