[Haskell-cafe] Evaluating arithmetic expressions at run time

[Andrew Savige]

Haskell beginner using GHC.

I have a function to do some simple arithmetic at run time:

myeval :: Int -> Int -> String -> Int
myeval x y "+" = (+) x y
myeval x y "-" = (-) x y
myeval x y "*" = (*) x y
-- ...

While that works, I'm curious to know if it can be done more
elegantly. I'm thinking of something like:

myeval :: Int -> Int -> String -> Int
myeval x y op = (read op) x y

Thanks,
/-\



		
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