[Haskell-cafe] CPS and the product function

[Sebastiaan Visser]

On Apr 20, 2009, at 4:32 PM, michael rice wrote:
> Hi Eugene,
>
> Clever solution.
>
> It didn't come right back so I interrupted it. Guess it would do all  
> those multiplies by zero.
>
> Does anyone know how to define it to avoid that?
>
> Thanks.
>
> Michael
>
> --- On Mon, 4/20/09, Eugene Kirpichov <ekirpichov at gmail.com> wrote:
>
> From: Eugene Kirpichov <ekirpichov at gmail.com>
> Subject: Re: [Haskell-cafe] CPS and the product function
> To: "michael rice" <nowgate at yahoo.com>
> Cc: haskell-cafe at haskell.org
> Date: Monday, April 20, 2009, 9:40 AM
>
> Check that by experiment in ghci or by looking at the source:
>
> Prelude*> product [0..]
>
> Or search "product" at http://holumbus.fh-wedel.de/hayoo/hayoo.html
> and click on one of the Source links.
>
> 2009/4/20 michael rice <nowgate at yahoo.com>:
> > I've been looking at CPS in Haskell and wondering how many  
> multiplications
> > the product function performs if it encounters a zero somewhere in  
> the input
> > list. Zero?
> >
> > Does anyone know the definition of the product function?
> >
> > Michael
> Eugene Kirpichov

Making multiplication non-strict?