Scala example source code file (partialsums.scala)

This example Scala source code file (partialsums.scala) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" ^TM.

Java - Scala tags/keywords

alternating, array, cookson, double, double, flint, gregory\n, gregory\n, harmonic\n, harmonic\n, hills\n, hills\n, riemann, zeta\n

The Scala partialsums.scala source code

/*
 * The Computer Language Shootout
 * http://shootout.alioth.debian.org/
 *
 * contributed by Andrei Formiga
 */

object partialsums
{
  val twodiv3 = 2.0 / 3.0
  var n: Double = _

  def calculate(s1: Double, s2: Double, s3: Double, s4: Double,
                s5: Double, s6: Double, s7: Double, s8: Double,
                s9: Double, sign: Double, kd: Double) {

    if (kd > n) {
      val f = "%.9f\t"

      Console.printf( f + "(2/3)^k\n", s1)
      Console.printf( f + "k^-0.5\n", s2)
      Console.printf( f + "1/k(k+1)\n", s3)
      Console.printf( f + "Flint Hills\n", s4)
      Console.printf( f + "Cookson Hills\n", s5)
      Console.printf( f + "Harmonic\n", s6)
      Console.printf( f + "Riemann Zeta\n", s7)
      Console.printf( f + "Alternating Harmonic\n" ,s8)
      Console.printf( f + "Gregory\n", s9)
    }
    else {
      val k2 =  Math.pow(kd, 2.0)
      val k3 = k2 * kd
      val sin = Math.sin(kd)
      val cos = Math.cos(kd)
      calculate(s1 + Math.pow(twodiv3, kd - 1.0), s2 + Math.pow(kd, -0.5),
		s3 + 1.0 / (kd * (kd + 1.0)), s4 + 1.0 / (k3 * sin*sin),
		s5 + 1.0 / (k3 * cos*cos), s6 + 1.0 / kd, s7 + 1.0 / k2,
		s8 + sign / kd, s9 + sign / (2.0 * kd - 1.0), -sign, kd + 1.0)
    }
  }

  def main(args: Array[String]) {
    n = Integer.parseInt(args(0)).toDouble
    calculate(0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 1.0, 1.0)
  }
}