diff options
| author | yugui <yugui@b2dd03c8-39d4-4d8f-98ff-823fe69b080e> | 2009-04-12 14:02:19 +0000 |
|---|---|---|
| committer | yugui <yugui@b2dd03c8-39d4-4d8f-98ff-823fe69b080e> | 2009-04-12 14:02:19 +0000 |
| commit | 447818ea3b2efabd172a4512444cc1a416a93265 (patch) | |
| tree | 0969d46b4f5fdf8eb21eddcacd86c7fc86e04914 /lib | |
| parent | 59429eebd02e27feeb488c62a8ed7035ec8d0441 (diff) | |
merges r22741 from trunk into ruby_1_9_1.
--
* lib/prime.rb (Prime::prime?): used to return a wrong answer.
[ruby-core:22646].
* test/test_prime.rb (test_prime?): test case for [ruby-core:22646].
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_1_9_1@23176 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
Diffstat (limited to 'lib')
| -rw-r--r-- | lib/prime.rb | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/lib/prime.rb b/lib/prime.rb index 650d279bc4..ce71d5e00f 100644 --- a/lib/prime.rb +++ b/lib/prime.rb @@ -144,6 +144,8 @@ class Prime # +value+:: an arbitrary integer to be checked. # +generator+:: optional. A pseudo-prime generator. def prime?(value, generator = Prime::Generator23.new) + value = -value if value < 0 + return false if value < 2 for num in generator q,r = value.divmod num return true if q < num |