It is strange because fromInt works in the hugs prompt But when I use it in my haskell script it doesn´t work.
Prelude>fromInt 5 :: Float (ok!)
but
average :: Int -> Float
average n = fromInt ( sum n ) :: Float / fromInt n :: Float
doesn´t work...
fromInteger works in hugs prompt and inside the haskell script too.
Stenio.
--------- Mensagem Original --------
De: "Iavor S. Diatchki" <[EMAIL PROTECTED]>
Para: "[EMAIL PROTECTED]" <[EMAIL PROTECTED]>
Cópia: [EMAIL PROTECTED], [EMAIL PROTECTED]
Assunto: Re: AW: [Haskell] Hugs Nov2003 X Nov2002
Data: 16/03/04 16:52
hi,
i believe you should use
fromIntegral :: (Integral a, Num b) => a -> b
Since Int is in the Integral class, and Float is in the Num class
this should do exactly the job you need.
For the other functions that were not working --- they were moved to
the Char module, so you need to add "import Char" at the top of your
program.
[EMAIL PROTECTED] wrote:
> try
>
> fromInt = fromInteger . toInteger
this does not seem like a good idea, as you start with an Int,
then convert it to an Integer, and then you make a Float out of that.
seems like a waste.
hope this helps
-iavor
>
> Markus
>
>
> --
> Markus Schnell
>
> -----Ursprüngliche Nachricht-----
> *Von:* [EMAIL PROTECTED]
> [mailto:[EMAIL PROTECTED] *Im Auftrag von *Stenio
> *Gesendet:* Dienstag, 16. März 2004 10:29
> *An:* Ketil Malde
> *Cc:* [EMAIL PROTECTED]
> *Betreff:* Re: [Haskell] Hugs Nov2003 X Nov2002
>
> fromInteger works, but it converts from Integer to Float. In my
> script, I need fromInt because it converts from Int to Float.
>
> Example:
>
> average :: Int -> Float
> average n = fromInt ( sum n ) :: Float / fromInt n :: Float
>
> It works only in Hugs November 2002
>
> Stenio.
>
> --------- Mensagem Original --------
> De: "Ketil Malde" <[EMAIL PROTECTED]>
> Para: "Stenio" <[EMAIL PROTECTED]>
> Cópia: [EMAIL PROTECTED]
> Assunto: Re: [Haskell] Hugs Nov2003 X Nov2002
> Data: 16/03/04 12:07
>
>
> "Stenio" <[EMAIL PROTECTED]> writes:
>
> > I was using Hugs November 2002 and the function fromInt
> works fine,
> > but in the version November 2003 the same function doesn´t work.
>
> I'm too lazy to check the standard, so I'll just assume Hugs was
> wrong. I think the solution is to use "fromIntegral" instead. GHCi
> also has "fromInteger", although I'm not quite sure why we
> need this
> in addition to "fromIntegral"? (Possibly because it is a member of
> Num, and it would break too much code to remove it)
>
> -kzm
> --
> If I haven't seen further, it is by standing in the footprints
> of giants
>
>
>
>------------------------------------------------------------------------
>
>_______________________________________________
>Haskell mailing list
>[EMAIL PROTECTED]
>http://www.haskell.org/mailman/listinfo/haskell
>
>
_______________________________________________
Haskell mailing list
[EMAIL PROTECTED]
http://www.haskell.org/mailman/listinfo/haskell
_______________________________________________ Haskell mailing list [EMAIL PROTECTED] http://www.haskell.org/mailman/listinfo/haskell
