Neil Mitchell wrote:
Hi
Under Hugs and Yhc, showing a Ratio 1%2 gives "1 % 2". Under GHC showing 1%2 gives "1%2". Does the standard say anything about this? Is someone wrong?
Yes, ghc is wrong here, the Haskell 98 report [1] specifies: instance (Integral a) => Show (Ratio a) where showsPrec p (x:%y) = showParen (p > ratPrec) (showsPrec (ratPrec+1) x . showString " % " . showsPrec (ratPrec+1) y) While it doesn't really matter, it is a deviation from the standard. I would personally prefer it if rationals were shown as "1%2", because the space is not needed, and other show instances such as lists don't insert spaces either. [1]: http://haskell.org/onlinereport/ratio.html Twan