pi で pi を求める (http://ch.nicovideo.jp/toeic990/blomaga/ar935178)

build.sbt

libraryDependencies += "org.skinny-framework" %% "skinny-http-client" % "2.0.2"
libraryDependencies += "org.slf4j" % "slf4j-simple" % "1.6.4"

mainClass := Some("Main")

scalaVersion := "2.11.7"

Main.scala

import skinny.http._

object Main extends App {
  val response: Response = HTTP.get("http://www.geocities.jp/f9305710/PAI1000000.html")
  //val response: Response = HTTP.get("http://www.example.com")
  var r = response.textBody
  r = r.substring(r.indexOfSlice("141592"), r.lastIndexOfSlice("</FONT>")).withFilter(_.isDigit).map(c => c)
  var incount = 0;
  var oncount = 0;
  var outcount = 0

  (r grouped 32) foreach { s =>
    if (s.length == 32) {
      print("0." + s.substring(0, 14) + "\t0." + s.substring(15, 29) + "\n")
      var p: Double = Math.pow(("0." + s.substring(0, 15)).toDouble, 2) + Math.pow(("0." + s.substring(16, 31)).toDouble, 2)
      //print(p)
      p match {
        case q if q < 1 => incount += 1
        case 1 => oncount += 1
        case q if q > 1 => outcount += 1
      }
      //println(" " + incount + " " + oncount + " " + outcount + " " + (4.0 * incount / (incount + outcount)))
      println(" "+ (4.0 * incount / (incount + outcount)))
    }
  }
}