[Haskell-beginners] read

[edgar klerks]

Hi Russ,

You probably have the monomorphism restriction turned of, so you don't get
an error message. If you add a type, it will work fine. Like this:

Prelude> read "123"
*** Exception: Prelude.read: no parse
Prelude> read "123" :: Int
123
Prelude>

Greets,

Edgar

On Wed, Oct 27, 2010 at 8:36 AM, Russ Abbott <russ.abbott at gmail.com> wrote:

> Hi,
>
> I'm having a problem with the read function. I thought it took a string and
> converted it into a value (if there is a conversion). But it doesn't seem to
> work for me on GHCi
>
> Prelude> read "123"
> *** Exception: Prelude.read: no parse
> Prelude> read (show 123)
> *** Exception: Prelude.read: no parse
>
>
> There must be something trivial that I'm missing.
>
> Thanks.
>
> *-- Russ Abbott*
>
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