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maiarib

[Resolvido] haskell instance show

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maiarib

data Frac =F Int Int

instance Show (Frac ) where 
show (F a b )=show(a)++"/"++show(b)

Porque dá erro ??

alguém me pode ajudar?

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maiarib

Ficha9 é o nome do module:

module Ficha9 where

o erro é :

    Ambiguous occurrence `show'

    It could refer to either `Ficha9.show', defined at Classes.hs:30:0

                          or `Prelude.show', imported from Prelude

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maiarib

Não..

o ficheiro é apenas:

module Ficha9 where

data Frac =F Int Int

instance Show (Frac ) where 
show (F a b )=show(a)++"/"++show(b)

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