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* ext/bigdecimal/lib/bigdecimal/util.rb (Rational#to_d):

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zero or negative precision is error.  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@32680 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
This commit is contained in:
mrkn 2011-07-26 15:49:47 +00:00
parent 079fb8d4c3
commit dca0b41777
3 changed files with 29 additions and 5 deletions
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9
ChangeLog
View file

@ -1,3 +1,12 @@
Wed Jul 27 00:50:00 2011 Kenta Murata <mrkn@mrkn.jp>
* ext/bigdecimal/lib/bigdecimal/util.rb (Rational#to_d):
zero or negative precision is error. fixes #5098.
[ruby-dev:44210]
* test/bigdecimal/test_bigdecimal_util.rb: add test for the above
change.
Wed Jul 27 00:48:00 2011 Kenta Murata <mrkn@mrkn.jp>
* ext/bigdecimal/lib/bigdecimal/util.rb (Float#to_d): modified for

10
ext/bigdecimal/lib/bigdecimal/util.rb
View file

@ -95,11 +95,11 @@ class Rational < Numeric
# # => #<BigDecimal:1a52bd8,'0.3142857142 8571427937 0154144999 105E1',45(63)>
# r.to_d(3)
# # => #<BigDecimal:1a44d08,'0.314E1',18(36)>
def to_d(nFig=0)
num = self.numerator.to_s
if nFig<=0
nFig = BigDecimal.double_fig*2+1
def to_d(precision)
if precision <= 0
raise ArgumentError, "negative precision"
end
BigDecimal.new(num).div(self.denominator,nFig)
num = self.numerator
BigDecimal(num).div(self.denominator, precision)
end
end

15
test/bigdecimal/test_bigdecimal_util.rb
View file

@ -25,4 +25,19 @@ class TestBigDecimalUtil < Test::Unit::TestCase
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
def test_Rational_to_d
digits = 100
delta = 1.0/10**(digits)
assert_in_delta(BigDecimal(1.quo(2), digits), 1.quo(2).to_d(digits), delta)
assert_in_delta(BigDecimal(355.quo(113), digits), 355.quo(113).to_d(digits), delta)
end
def test_Rational_to_d_with_zero_precision
assert_raise(ArgumentError) { 355.quo(113).to_d(0) }
end
def test_Rational_to_d_with_negative_precision
assert_raise(ArgumentError) { 355.quo(113).to_d(-42) }
end
end