* 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.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@32680 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 5 insertions, 5 deletions

diff --git a/ext/bigdecimal/lib/bigdecimal/util.rb b/ext/bigdecimal/lib/bigdecimal/util.rb
index 1e4bbbb596..b27e64c511 100644
--- a/ext/bigdecimal/lib/bigdecimal/util.rb
+++ b/ext/bigdecimal/lib/bigdecimal/util.rb
@@ -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