diff options
| author | ayumin <ayumin@b2dd03c8-39d4-4d8f-98ff-823fe69b080e> | 2014-05-08 18:22:29 +0000 |
|---|---|---|
| committer | ayumin <ayumin@b2dd03c8-39d4-4d8f-98ff-823fe69b080e> | 2014-05-08 18:22:29 +0000 |
| commit | bef8e4557c260e4eccb6266c874b37b32b3ee7a9 (patch) | |
| tree | 98874b138722af9c288165aeff3a46141f31fcab /lib/prime.rb | |
| parent | 16b8aadc75a50f8c9472f049de4e68678380b823 (diff) | |
* lib/prime.rb (Prime#prime?): negative numbers can't be primes
by definition. reported by Ivan Kataitsev. [Bug #7395]
* test/test_prime.rb: add test.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@45878 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
Diffstat (limited to 'lib/prime.rb')
| -rw-r--r-- | lib/prime.rb | 1 |
1 files changed, 0 insertions, 1 deletions
diff --git a/lib/prime.rb b/lib/prime.rb index f359c12693..6d3936e317 100644 --- a/lib/prime.rb +++ b/lib/prime.rb @@ -157,7 +157,6 @@ 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 |