1:  package de.luschny.math.factorial;

   2:   

   3:  import de.luschny.math.arithmetic.Xint;

   4:   

   5:  public class FactorialProductNaive implements IFactorialFunction

   6:  {

   7:   

   8:      public FactorialProductNaive()

   9:      {

  10:      }

  11:   

  12:      public String getName()

  13:      {

  14:          return "ProductNaive        ";

  15:      }

  16:   

  17:      public Xint factorial(int n)

  18:      {

  19:          if (n < 0)

  20:          {

  21:              throw new ArithmeticException("Factorial: n has to be >= 0, but was " + n);

  22:          }

  23:   

  24:          Xint nFact = Xint.ONE;

  25:   

  26:          for (int i = 2; i <= n; i++)

  27:          {

  28:              nFact = nFact.multiply(i);

  29:          }

  30:   

  31:          return nFact;

  32:      }

  33:   

  34:  } // endOfFactorialProductNaive