summaryrefslogtreecommitdiff
path: root/jni/ruby/benchmark/bm_so_sieve.rb
blob: 43dc30264854d6905cd3b4df761fc42634748d15 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
# from http://www.bagley.org/~doug/shootout/bench/sieve/sieve.ruby
num = 500
count = i = j = 0
flags0 = Array.new(8192,1)
k = 0
while k < num
  k += 1
  count = 0
  flags = flags0.dup
  i = 2
  while i<8192
    i += 1
    if flags[i]
      # remove all multiples of prime: i
      j = i*i
      while j < 8192
        j += i
        flags[j] = nil
      end
      count += 1
    end
  end
end
count