Scala example source code file (sieve.scala)

This example Scala source code file (sieve.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, count, count, int, int

The Scala sieve.scala source code

/* The Computer Language Shootout 
   http://shootout.alioth.debian.org/
   contributed by Isaac Gouy (Scala novice)
*/

object sieve {
   def main(args: Array[String]) = {
      var n = toPositiveInt(args);
      val start = 2;
      val stop = 8192;
      val isPrime = new Array[Boolean](stop+1);
      var count: Int = 0;

      while (n>0) { 
         count = 0;

         for (i <- Iterator.range(start,stop+1)) 
            isPrime(i)=true;

         for (i <- Iterator.range(start,stop+1)) {
            if( isPrime(i) ) {
               var k = i+i;
               while (k<=stop) { isPrime(k)=false; k=k+i; }
               count = count+1;
            }
         }
         n=n-1; 
      }

      Console.println("Count: " + count);
   }


   private def toPositiveInt(s: Array[String]) = {
      val i = 
         try { Integer.parseInt(s(0)); } 
         catch { case _ => 1 }
      if (i>0) i; else 1;
   }
}