蒙特卡罗方法计算pi

import scala.math.random

object LocalPi {
  def main(args: Array[String]) {
    var count = 0
    for (i <- 1 to 100000000) {
      val x = random * 2 - 1
      val y = random * 2 - 1
      if (x*x + y*y <= 1) count += 1
    }
    println(s"Pi is roughly ${4 * count / 100000000.0}")
  }
}