diff options
author | yugui <yugui@b2dd03c8-39d4-4d8f-98ff-823fe69b080e> | 2009-07-15 11:58:10 +0000 |
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committer | yugui <yugui@b2dd03c8-39d4-4d8f-98ff-823fe69b080e> | 2009-07-15 11:58:10 +0000 |
commit | 52cc8ef40d74007e010f36707b45e51cfbd14f0b (patch) | |
tree | ebab2e950b69f470b5b8725eaf62e8cf01a38350 /lib | |
parent | 68e6b4ccbd668ff79a134c870d6481e8e3152313 (diff) |
merges r24091 from trunk into ruby_1_9_1.
--
* lib/prime.rb (Prime#prime_division): now decomposes
negative integer into a decomposition with element [-1, 1].
* test/test_prime.rb: test for it.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_1_9_1@24121 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
Diffstat (limited to 'lib')
-rw-r--r-- | lib/prime.rb | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/lib/prime.rb b/lib/prime.rb index 4114beb292..c8c9265571 100644 --- a/lib/prime.rb +++ b/lib/prime.rb @@ -194,7 +194,12 @@ class Prime # def prime_division(value, generator= Prime::Generator23.new) raise ZeroDivisionError if value == 0 - pv = [] + if value < 0 + value = -value + pv = [[-1, 1]] + else + pv = [] + end for prime in generator count = 0 while (value1, mod = value.divmod(prime) |