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
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