Hi,
*Main> 0.2 + 0.1
0.30000000000000004
Prelude> (0.1 :: Float) + (0.2 :: Float)
0.3
Prelude> (0.1 :: Double) + (0.2 :: Double)
0.30000000000000004
Prelude> (0.1 :: Float) + 0.2 == 0.3
True
If you use Float's instead of doubles, it stores less precision, and
so gets it right.
Also, if what you really want is decimals, why not:
data Decimal = Decimal {dps :: Integer, value :: Integer}
Then define your Num instance on Decimal, and have perfect high
fidelity numbers throughout.
Thanks
Neil
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