Re: [Haskell-cafe] Evaluating arithmetic expressions at run time

On Sat, 28 Jan 2006, Andrew Savige wrote:

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 -- ...

Additionally to the other suggestions, I advise using a custom type data Op = Add | Sub | Mul instead of String, if possible.