Hello Everyone!
I am relatively new to Haskell (actually it's my second day) and I have the following problem:
If I define a new datatype, for example a Binary tree, how can i use the show function to put an instance of my datatype into a String representation. I have seen in different Tutorials that there is a way for overloading the show function for my own type, and I tried out, what was presented in the tutorials, but it didn't work. Does somebody know, how to manage this?
Here my attempts:
data Entry a = EmptyEntry | MakeEntry a a
You could make use of the default show by simply deriving Show:
data Entry a = EmptyEntry | MakeEntry a a
deriving ShowOtherwise you need to provide an instance of Show for your type, as such:
instance Show a => Show (Entry a) where
show EmptyEntry = "Empty"
show (MakeEntry x y) = show x ++ ": " ++ show y(untested code)
-marius
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