HaskellのRational

Prelude> import Data.Ratio
Prelude Data.Ratio> numerator (1 % 3)
1
Prelude Data.Ratio> denominator (1 % 3)
3
Prelude Data.Ratio> 1 / 3 :: Rational
1 % 3
Prelude Data.Ratio> 3 / 3 :: Rational
1 % 1

numeratorが分子 denominatorが分母

Haskell : numerator

Haskell : denominator