From: Glenn Jackman <glennj@...>
Date: 2009-07-23T03:17:19+09:00
Subject: Re: Bug Rounding Floats? (9.245 * 100).round => 924? S/B 925!

At 2009-07-22 02:08PM, "Glenn Jackman" wrote:
>  At 2009-07-22 01:37PM, "Thomas Preymesser" wrote:
> >  [Note:  parts of this message were removed to make it a legal post.]
> >  
> >  2009/7/22 ddoherty03 <ddoherty03@gmail.com>
> >  
> >  
> > > For example, (9.245 * 100).round should be 925, but my ruby gives 924.
> > >
> >  
> >  try what your term really is:
> >  
> >   printf("%.50f",9.245 * 100)
>  
>  Welcome to IEEE floating-point arithmetic.  Any programming language
>  that uses it will be subject to the same results.

A workaround, convert the expression to a string and back to a number:
    
    num = Float("%.1f" % (9.245 * 100)).round

    puts "yippee" if num == 925 


-- 
Glenn Jackman
    Write a wise saying and your name will live forever. -- Anonymous