[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")