On Mon, 28 Jul 2008, Peter Gibbs wrote:
> ----- Original Message ----- From: "Will Coleda" <[EMAIL PROTECTED]>
>
> > To properly support $tcl_precision in tcl, I need to change how I'm
> > currently implementing {$tcl_precision == 0}. Right now, I just fake
> A few points to ponder.
> 1) The default precision for %g in C is 6 significant digits, i.e. 1.57080
> (but sprintf drops trailing zeroes)
> 2) 1.5707963267948966 actually corresponds to 17-digit precision (which is the
> limit for double), not 16
> 3) tcl uses its own special handling for tcl_precision = 0, refer to
> http://www.tcl.tk/cgi-bin/tct/tip/132.html for more information
> 4) Look at David Gay's code (see http://www.netlib.org/fp/index.html,
> specifically gdtoa) for similar logic
> 5) Although I haven't looked, the tcl source code must contain their actual
> implementation
>
> I don't know whether we expect enough usage of Parrot in mathemetical circles
> to be worthwhile adding one of these implementions to our version of sprintf.
Perl5 certainly gets used in situations where such issues are relevant.
Every time we make a change that affects that last digit, we receive bug
reports about it.
--
Andy Dougherty [EMAIL PROTECTED]
