Re: [Haskell-cafe] CPS and the product function

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 wrote:

From: Eugene Kirpichov Subject: Re: [Haskell-cafe] CPS and the product function To: "michael rice" Cc: haskell-cafe@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.

...

I've been looking at CPS in Haskell and wondering how many multiplications the product function performs if it encounters a zero somewhere in

2009/4/20 michael rice : the input

...

list. Zero?

Does anyone know the definition of the product function?

Michael Eugene Kirpichov

Making multiplication non-strict?