[Haskell-cafe] about integer and float operations
manlio_perillo at libero.it
Wed Feb 4 17:13:41 EST 2009
Yitzchak Gale ha scritto:
> exactDiv :: (Real a, Real b, Fractional c) => a -> b -> c
> x `exactDiv` y = realToFrac x / realToFrac y
> Python does that same type coercion automatically at runtime.
No, this is not correct.
CPython converts to float only for a "simple" integer (since conversion
from machine int to machine float will never overflow).
For a "long integer" it uses a special algorithm for computing the
division, that avoids overflow if the final result is in the range of a
Thanks Manlio Perillo
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