[Haskell-beginners] Re: Showing control characters

[Russ Abbott]

I wasn't at a computer with Haskell when I wrote the earlier message.
 Here's how it seems to work.

File:

*data *MyType = MyType

*instance *Show MyType *where*
    show MyType = "a\nb"



Load the above file. Then:

> MyType        -- This does what I want it to do after all.
a
b

> show MyType
"a\nb"

> putStrLn (show MyType)
a
b

> print MyType
a
b



*-- Russ Abbott
_____________________________________________*
*  Professor, Computer Science
  California State University, Los Angeles

  Google voice: 424-235-5752 (424-cell-rja)
  blog: http://russabbott.blogspot.com/
  vita:  http://sites.google.com/site/russabbott/
_____________________________________________*



On Tue, Nov 9, 2010 at 9:40 AM, Russ Abbott <russ.abbott at gmail.com> wrote:

> Is there some way to include control characters in a Show string so that
> they take effect when the element is Shown?
>
> For example, if I define a String "a\nb" and use putStrLn on it, the \n
> causes a return, but when I simply return the string from a function, the \n
> is shown as \n.  Is there a way to get the \n to execute when it's embedded
> in a returned value?
>
> Thanks
> *
> -- Russ Abbott
> _____________________________________________*
> *  Professor, Computer Science
>   California State University, Los Angeles
>
>   Google voice: 424-235-5752 (424-cell-rja)
>   blog: http://russabbott.blogspot.com/
>   vita:  http://sites.google.com/site/russabbott/
> _____________________________________________*
>
>
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