From 36a0c276d2fce22aa53427b1d7519cb476801f63 Mon Sep 17 00:00:00 2001
From: yugui <yugui@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
Date: Tue, 3 Mar 2009 15:57:15 +0000
Subject: * 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: http://svn.ruby-lang.org/repos/ruby/trunk@22741 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
---
 lib/prime.rb | 2 ++
 1 file changed, 2 insertions(+)

(limited to 'lib')

diff --git a/lib/prime.rb b/lib/prime.rb
index 650d279bc..ce71d5e00 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
-- 
cgit