[Haskell-cafe] what did I do wrong

[Osager Prairie]

you should do :

main = print $ center (1,2), (3, 4)


On Sat, May 10, 2014 at 1:51 PM, Roelof Wobben <r.wobben at home.nl> wrote:

>  Hello,
>
> I have to find the center of 2 points as a assigment for a course on
> fpcomplete. This is no homework because I do a self-study.
>
> So I did  this:
>
> center (x1,y1) (x2,y2) = ( ((x1+x2)/2),((y1+y2)/2) )
> main = print $ center ((1,2), (3, 4))
>
> but now I see this error message :
>
> Main.hs at 2:8-2:13
>
>    -  No instance for (Show (((t0, t1), (t2, t3)) -> ((t0, t1), (t2,
>    t3)))) arising from a use of `print' Possible fix: add an instance
>    declaration for (Show (((t0, t1), (t2, t3)) -> ((t0, t1), (t2, t3)))) In
>    the expression: print In the expression: print $ center ((1, 2), (3, 4)) In
>    an equation for `main': main = print $ center ((1, 2), (3, 4))
>
>  Roelof
>
>
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