モンテカルロ法で円周率を求めるRubyスクリプト

monte.rb

ans0 = 0
sampling_num = 1000000

(1..sampling_num).each do
  list = [Random.rand(1.0), Random.rand(1.0)]
  range = Math.sqrt(list[0]**2 + list[1]**2)
  if range < 1.0
    ans0 += 1
  end
end

p 4 * (ans0.to_f / sampling_num)