Tech Interview Question Tip – AS3 – Compute Factorial Iterative and Recursive

package 
{
 import flash.display.Sprite;
 /**
  * ...
  * @author Jeff Fulton
  */
 public class ComputeFactorial extends Sprite
 {

  /*In mathematics, the factorial of a positive integer n,[1]
   * denoted by n!, is the product of all positive integers
   * less than or equal to n.
   * There are two methods. Recursion is the classic method
   * Code Complete says that recursion is a improper method
   * Second version is the code complete iteration version
   */

  public function ComputeFactorial()
  {

   //recusrive methos
   trace ("recursive:",recursiveFactorial(3));
   trace ("iterative:",iterativeFactorial(3));

  }

  private function recursiveFactorial(num:int):int {
   if (num <= 1) {
    return(1);
   }else {
    return (num * recursiveFactorial(num - 1));
   }
  }

  private function iterativeFactorial(num:int):int {
   var result:int = 1;

   for (var factor:int = 2; factor <= num; factor++) {
    result = result * factor;
   }

   return result;
  }

 }
}

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