From 3cbda570c22f0324502a43dc668223b3da5d241b Mon Sep 17 00:00:00 2001 From: mrkn Date: Sat, 18 Sep 2010 20:19:38 +0000 Subject: * ext/bigdecimal/bigdecimal.c: fix rounding algorithms for half-down and half-even. This change is based on the patch created by Matthew Willson, the reporter of this bug. [Bug #3803] [ruby-core:32136] * test/bigdecimal/test_bigdecimal.rb: add tests for above changes. git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@29293 b2dd03c8-39d4-4d8f-98ff-823fe69b080e --- test/bigdecimal/test_bigdecimal.rb | 12 ++++++++++++ 1 file changed, 12 insertions(+) (limited to 'test') diff --git a/test/bigdecimal/test_bigdecimal.rb b/test/bigdecimal/test_bigdecimal.rb index 02a067a810..2efa65b57b 100644 --- a/test/bigdecimal/test_bigdecimal.rb +++ b/test/bigdecimal/test_bigdecimal.rb @@ -612,6 +612,18 @@ class TestBigDecimal < Test::Unit::TestCase assert_equal(3, x.round(0, BigDecimal::ROUND_CEILING)) assert_equal(2, x.round(0, BigDecimal::ROUND_FLOOR)) assert_raise(TypeError) { x.round(0, 256) } + + 15.times do |n| + x = BigDecimal.new("5#{'0'*n}1") + assert_equal(10**(n+2), x.round(-(n+2), BigDecimal::ROUND_HALF_DOWN)) + assert_equal(10**(n+2), x.round(-(n+2), BigDecimal::ROUND_HALF_EVEN)) + x = BigDecimal.new("0.5#{'0'*n}1") + assert_equal(1, x.round(0, BigDecimal::ROUND_HALF_DOWN)) + assert_equal(1, x.round(0, BigDecimal::ROUND_HALF_EVEN)) + x = BigDecimal.new("-0.5#{'0'*n}1") + assert_equal(-1, x.round(0, BigDecimal::ROUND_HALF_DOWN)) + assert_equal(-1, x.round(0, BigDecimal::ROUND_HALF_EVEN)) + end end def test_truncate -- cgit v1.2.3