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author | nobu <nobu@b2dd03c8-39d4-4d8f-98ff-823fe69b080e> | 2016-11-05 09:49:39 +0000 |
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committer | nobu <nobu@b2dd03c8-39d4-4d8f-98ff-823fe69b080e> | 2016-11-05 09:49:39 +0000 |
commit | dfe91fcd08e7e255b5cb1b306e53bea1ddb54e5f (patch) | |
tree | d209f0b546e45cb8d8fa7fc2bbbb5044e53e2c8f /test/test_mathn.rb | |
parent | 76977611dd68e384fdce8c546efda5e1931e67a6 (diff) | |
download | ruby-dfe91fcd08e7e255b5cb1b306e53bea1ddb54e5f.tar.gz |
numeric.c: round to nearest even
* numeric.c (flo_round, int_round): support round-to-nearest-even
semantics of IEEE 754 to match sprintf behavior, and add `half:`
optional keyword argument for the old behavior.
[ruby-core:76273] [Bug #12548]
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@56590 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
Diffstat (limited to 'test/test_mathn.rb')
-rw-r--r-- | test/test_mathn.rb | 50 |
1 files changed, 46 insertions, 4 deletions
diff --git a/test/test_mathn.rb b/test/test_mathn.rb index aaf132ba88..2ea049502c 100644 --- a/test/test_mathn.rb +++ b/test/test_mathn.rb @@ -96,17 +96,17 @@ class TestMathn < Test::Unit::TestCase def test_round assert_separately(%w[-rmathn], <<-EOS, ignore_stderr: true) assert_equal( 3, ( 13/5).round) - assert_equal( 3, ( 5/2).round) + assert_equal( 2, ( 5/2).round) assert_equal( 2, ( 12/5).round) assert_equal(-2, (-12/5).round) - assert_equal(-3, ( -5/2).round) + assert_equal(-2, ( -5/2).round) assert_equal(-3, (-13/5).round) assert_equal( 3, ( 13/5).round(0)) - assert_equal( 3, ( 5/2).round(0)) + assert_equal( 2, ( 5/2).round(0)) assert_equal( 2, ( 12/5).round(0)) assert_equal(-2, (-12/5).round(0)) - assert_equal(-3, ( -5/2).round(0)) + assert_equal(-2, ( -5/2).round(0)) assert_equal(-3, (-13/5).round(0)) assert_equal(( 13/5), ( 13/5).round(2)) @@ -115,6 +115,48 @@ class TestMathn < Test::Unit::TestCase assert_equal((-12/5), (-12/5).round(2)) assert_equal(( -5/2), ( -5/2).round(2)) assert_equal((-13/5), (-13/5).round(2)) + + assert_equal( 3, ( 13/5).round(half: :even)) + assert_equal( 2, ( 5/2).round(half: :even)) + assert_equal( 2, ( 12/5).round(half: :even)) + assert_equal(-2, (-12/5).round(half: :even)) + assert_equal(-2, ( -5/2).round(half: :even)) + assert_equal(-3, (-13/5).round(half: :even)) + + assert_equal( 3, ( 13/5).round(0, half: :even)) + assert_equal( 2, ( 5/2).round(0, half: :even)) + assert_equal( 2, ( 12/5).round(0, half: :even)) + assert_equal(-2, (-12/5).round(0, half: :even)) + assert_equal(-2, ( -5/2).round(0, half: :even)) + assert_equal(-3, (-13/5).round(0, half: :even)) + + assert_equal(( 13/5), ( 13/5).round(2, half: :even)) + assert_equal(( 5/2), ( 5/2).round(2, half: :even)) + assert_equal(( 12/5), ( 12/5).round(2, half: :even)) + assert_equal((-12/5), (-12/5).round(2, half: :even)) + assert_equal(( -5/2), ( -5/2).round(2, half: :even)) + assert_equal((-13/5), (-13/5).round(2, half: :even)) + + assert_equal( 3, ( 13/5).round(half: :up)) + assert_equal( 3, ( 5/2).round(half: :up)) + assert_equal( 2, ( 12/5).round(half: :up)) + assert_equal(-2, (-12/5).round(half: :up)) + assert_equal(-3, ( -5/2).round(half: :up)) + assert_equal(-3, (-13/5).round(half: :up)) + + assert_equal( 3, ( 13/5).round(0, half: :up)) + assert_equal( 3, ( 5/2).round(0, half: :up)) + assert_equal( 2, ( 12/5).round(0, half: :up)) + assert_equal(-2, (-12/5).round(0, half: :up)) + assert_equal(-3, ( -5/2).round(0, half: :up)) + assert_equal(-3, (-13/5).round(0, half: :up)) + + assert_equal(( 13/5), ( 13/5).round(2, half: :up)) + assert_equal(( 5/2), ( 5/2).round(2, half: :up)) + assert_equal(( 12/5), ( 12/5).round(2, half: :up)) + assert_equal((-12/5), (-12/5).round(2, half: :up)) + assert_equal(( -5/2), ( -5/2).round(2, half: :up)) + assert_equal((-13/5), (-13/5).round(2, half: :up)) EOS end end |