[Haskell-cafe] money type ?

[Simon Michael]

Good day all,

my budding ledger program could not balance transactions exactly because of 
rounding error with Double. I *think* I got it working better with Rational 
(it was late). Another suggestion from #haskell was to multiply all money 
by 100. I'm tracking multiple currencies/commodities with varying precision 
so this gets a bit more complicated.

Is there a type or library out there that's good for representing money and 
other quantities while avoiding rounding errors  ?

Best - Simon