Created
December 20, 2014 07:22
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prime number ruby
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#!/usr/bin/env ruby | |
# encoding: utf-8 | |
def check_prime(num,array) | |
i = 0 | |
sq_number = Math.sqrt(num).ceil.to_i | |
array.size.times do | |
if num % array[i] == 0 | |
return false | |
else | |
break if(array[i] > sq_number) | |
i += 1 | |
end | |
end | |
return array[-1] | |
end | |
start = Time.now.to_f | |
primenumbers = [2, 3] | |
# puts 2 | |
# puts 3 | |
num = 5 | |
i = 1 | |
while (i < 100000) do | |
if check_prime(num, primenumbers) | |
puts num | |
primenumbers.push(num) | |
end | |
num += 2 | |
i += 1 | |
end | |
endt = Time.now.to_f | |
puts ((endt - start)*1000).to_s + "ミリ秒" |
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