11 lines
396 B
Haskell
11 lines
396 B
Haskell
-- | Show at least n decimal places
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showRational :: Natural -> Rational -> String
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showRational n r = let
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sign = if r < 0 then '-' else '+'
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(integer, rest) = (numerator r `quotRem` denominator r)
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decimal = show $ rest * 10 ^ n `quot` denominator r
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zeroes = replicate (fromIntegral n - length decimal) '0'
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in sign : show integer ++ "." ++ zeroes ++ decimal
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