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* lib/prime.rb (Prime::prime?): used to return a wrong answer.

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[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/trunk@22741 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
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yugui 2009-03-03 15:57:15 +00:00
parent 27cc677088
commit 294f45b0fc
3 changed files with 24 additions and 0 deletions
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2
lib/prime.rb
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@ -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