From: John Kopanas <kopanas@...>
Date: 2007-01-25T03:46:00+09:00
Subject: Re: Exception Handling/Divide By Zero/NaN Done on One Line

I need to keep it as a float... that is my problemo :-(.

On 1/24/07, Rob Biedenharn <Rob@agileconsultingllc.com> wrote:
>
> On Jan 24, 2007, at 10:52 AM, ara.t.howard@noaa.gov wrote:
>
> > On Thu, 25 Jan 2007, John Kopanas wrote:
> >
> >> I have the following:
> >>
> >> a = (y != 0) ? (x/y) : 0
> >>
> >> There must be a sexier way of doing this!  Any suggestions?
> >>
> >> On a side note... how do we do exception handling on the same line
> >> as statement?
> >>
> >> a = x/y rescue 0
> >>
> >> That does not work but does it make sense?  Is it because dividing by
> >> zero does not throw an exception?
> >>
> >> Thanks for your help! :-)
> >>
> >
> > works for me?
> >
> >   harp:~ > ruby -e'  a = 42/0 rescue 42;  p a  '
> >   42
> >
> > i think you're doing the right thing with
> >
> >> a = x/y rescue 0
> >
> > how doesn't it work?
> >
> > regards.
> >
> > -a
> > --
> > we can deny everything, except that we have the possibility of
> > being better.
> > simply reflect on that.
> > - the dalai lama
>
> If you're not limited to Integers:
>
>  >> 1/0
> ZeroDivisionError: divided by 0
>          from (irb):1:in `/'
>          from (irb):1
>  >> 1.0/0
> => Infinity
>  >> 1/0.0
> => Infinity
>  >> 0.0/0.0
> => NaN
>  >>
>
> If either x or y are Float, then dividing by zero isn't an exception.
>
> You could force an exception if you want to get back to an Integer:
>
>  >> (1.0/0).to_i
> FloatDomainError: Infinity
>          from (irb):7:in `to_i'
>          from (irb):7
>  >> (0.0/0.0).to_i
> FloatDomainError: NaN
>          from (irb):8:in `to_i'
>          from (irb):8
>
> -Rob
>
> Rob Biedenharn          http://agileconsultingllc.com
> Rob@AgileConsultingLLC.com
>
>
>
>


-- 
John Kopanas
john@kopanas.com

http://www.kopanas.com
http://www.cusec.net
http://www.soen.info