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| author | taylorfausak <taylor@fausak.me> | 2019-10-03 22:44:17 -0400 |
|---|---|---|
| committer | Marge Bot <ben+marge-bot@smart-cactus.org> | 2019-11-01 04:54:47 -0400 |
| commit | 3932fb97f59d78a91aaf99e7ea3ae04e6a5a10ea (patch) | |
| tree | 88d2f0dbe414ac154d53768cafaaf0e79c7b41e9 | |
| parent | dc4876421386b406dd43a6015f09d92c3e9fb7d8 (diff) | |
| download | haskell-3932fb97f59d78a91aaf99e7ea3ae04e6a5a10ea.tar.gz | |
Fix rounding around 0
| -rw-r--r-- | libraries/base/GHC/Real.hs | 15 |
1 files changed, 9 insertions, 6 deletions
diff --git a/libraries/base/GHC/Real.hs b/libraries/base/GHC/Real.hs index 67ccf77596..b0f419896d 100644 --- a/libraries/base/GHC/Real.hs +++ b/libraries/base/GHC/Real.hs @@ -509,12 +509,15 @@ instance (Integral a) => RealFrac (Ratio a) where properFraction (x:%y) = (fromInteger (toInteger q), r:%y) where (q,r) = quotRem x y round r = - let (n, f) = properFraction r - in case (compare (abs f) 0.5, odd n) of - (LT, _) -> n - (EQ, False) -> n - (EQ, True) -> n + signum n - (GT, _) -> n + signum n + let + (n, f) = properFraction r + x = if r < 0 then -1 else 1 + in + case (compare (abs f) 0.5, odd n) of + (LT, _) -> n + (EQ, False) -> n + (EQ, True) -> n + x + (GT, _) -> n + x -- | @since 2.0.1 instance (Show a) => Show (Ratio a) where |