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* ext/bigdecimal/lib/bigdecimal/util.rb (Float#to_d): modified for

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specifying precision.  fixes #5098.  [ruby-dev:44210]
* test/bigdecimal/test_bigdecimal_util.rb: add test for the above
  change.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@32679 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
This commit is contained in:
mrkn 2011-07-26 15:48:25 +00:00
parent 2fd6b26620
commit 079fb8d4c3
3 changed files with 23 additions and 2 deletions
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13
test/bigdecimal/test_bigdecimal_util.rb
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@ -12,4 +12,17 @@ class TestBigDecimalUtil < Test::Unit::TestCase
assert_equal(BigDecimal(1), 1.to_d)
assert_equal(BigDecimal(2<<100), (2<<100).to_d)
end
def test_Float_to_d_without_precision
delta = 1.0/10**(Float::DIG + 1)
assert_in_delta(BigDecimal(0.5, Float::DIG+1), 0.5.to_d, delta)
assert_in_delta(BigDecimal(355.0/113.0, Float::DIG+1), (355.0/113.0).to_d, delta)
end
def test_Float_to_d_with_precision
digits = 5
delta = 1.0/10**(digits)
assert_in_delta(BigDecimal(0.5, 5), 0.5.to_d(digits), delta)
assert_in_delta(BigDecimal(355.0/113.0, 5), (355.0/113.0).to_d(digits), delta)
end
end