From: Neve Le <nevele@...>
Date: 2010-06-30T21:06:58+09:00
Subject: Re: Increase significant digits in Float

Siep Korteling wrote:
>> Xavier Noria wrote:
>> That 15 is hard-coded in the definition of Float#to_s.
> 
> Yes, and exposing more digits is not accurate:
> The float is bogus  after the 16th digit.


Working with big numbers here, it seems that precision is only 
guaranteed to 15 digits on either side of the decimal. When a whole 
number >15 digits is divided the decimal is approximated, and anything 
>17 digits prints a float of n.0 no matter how it's "%n.nf" formatted.


Is the hard-coded 15 just a "safe" limit? Would I be able to recompile 
ruby with a higher definition? If possible, how high could I go?
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