Re: [pure-lang-users] Numeric Arguments

[Libor S. <li...@gm...>]

Eddie, you are right that C's fmod is different.
What I was after was just "double mod int" which seems pretty innocuous
to me. I have defined it myself and it saved me lots of lines of repetitious
code to duplicate everything for ::int and ::double, so I thought others
might also benefit from its addition.

I note what Albert had to say on the matter and it is OK by me.
It is no big deal, I can live with my own definition if it is not added.

Albert did mention div which is a similar beast. 
Various misguided historical precedents notwithstanding, 
I would prefer the following behaviour:

Both to accept all types of numerical arguments.
div to "narrow" ie. if either argument is an int, return int
/ to "widen", ie. if either argument is a double, return double

This is more forgiving and consistent, therefore imho more in the "pure" spirit.
However, I guess ultimately it is just a personal preference.

L.


On Mon, 07 Jul 2008 22:20:35 +0100, Eddie Rucker <er...@bm...> wrote:

>> > // mod of a double
>> > x::double mod y::int = (x - intx) + (intx mod y) when intx = (int x) end;
>>
>> If memory serves me, Common Lisp has this, but not any Algol-like
>> language I know. I can add it to math.pure if there's enough demand.
>
> I've had to deal with this once in Pascal somewhere before but I cant
> recall. In that occasion I found that mod(double, double) may be defined
> in two ways in order to stay consistent with something else ... Dang I
> can't find it on google.
>
> I don't know if you should add "double mod double" to the list or not
> but I sure would hate to have to look it up again. If memory servers me
> (probably doesn't) C's definition of fmod really should be called frem
> instead because there is a difference between real mod and real
> remainder. I guess I better shut up now before I stick my foot in my
> mouth.
>
> e.r.
>
>
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