From: Sean O'Dell <sean@...>
Date: 2004-05-13T02:22:10+09:00
Subject: Re: Major Addition Bug?

On Wednesday 12 May 2004 10:12, Jim Freeze wrote:
> On Thursday, 13 May 2004 at  2:07:52 +0900, Sean O'Dell wrote:
> > On Wednesday 12 May 2004 09:53, ts wrote:
> > > >>>>> "S" == Sean O'Dell <sean@celsoft.com> writes:
> > >
> > > S> raise "false" if ((625.91 + 900.00 + 22.00) != 1547.91)
> > >
> > >  Well, this is well known
> >
> > Well known?  I had no idea this bug existed until I wrote a line of code
> > that double-checked the arithmetic from a different app.  I have code all
> > over doing simple arithmetic like this.  Ruby can't add 3 simple numbers?
> >  I don't mean to be disproportionately negative, but that shakes my faith
> > more than a little.  It's just simple arithmetic.  How old is this bug? 
> > When is it getting fixed?
> >
> > 	Sean O'Dell
>
> Sorry, to shake your faith, but consider the following:
>
>   jfn@juno 124 /home/jfn/tmp > cat n.c
>   int main()
>   {
>     printf("%.24f\n", 625.91+900.00+22.00);
>   }
>   jfn@juno 125 /home/jfn/tmp > ./a.out
>   1547.909999999999854480847716
>
>
> You might want to try the rational library.

I don't expect a script language to have those same rounding problems, so I 
hope this gets fixed quickly.  Thanks for the tip.

	Sean O'Dell