Scala example source code file (harmonic.scala)

This example Scala source code file (harmonic.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

array, array, decimalformat, double, double, fieldposition, fieldposition, int, int, stringbuffer, text

The Scala harmonic.scala source code

/* ------------------------------------------------------------------ */
/* The Great Computer Language Shootout                               */
/* http://shootout.alioth.debian.org/                                 */
/*                                                                    */
/* Contributed by Anthony Borla                                       */
/* ------------------------------------------------------------------ */

import java.text.DecimalFormat;
import java.text.FieldPosition;

object harmonic
{
  def main(args: Array[String])
  {
    var n = Integer.parseInt(args(0));

    var value = harmonic(n, 0.0);

    val formatter = new DecimalFormat("#.000000000");
    var formattedValue = formatter.format(value, new StringBuffer(), new FieldPosition(0));

    System.out.println(formattedValue);
  }

  final def harmonic(n: Int, a: Double): Double =
    if (n == 0) a else harmonic(n - 1, a + 1.0 / n);
}