Re: Re[2]: [Haskell-cafe] Reading integers

[Lennart Augustsson]

What about negative numbers?

Also, don't use (ord c - ord '0'), it doesn't work with Unicode digits.
That's why there is a digitToInt function.

        -- Lennart

On Sep 7, 2006, at 02:12 , Bulat Ziganshin wrote:

readI = foldl f 0

where f m c | isDigit c = fromIntegral (ord c - ord '0') + (m * 10)

              | otherwise  =  error ("Non-digit "++[c]++" in readI")

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