// Program to compute the factorial of a
// number entered by the user

import javax.swing.JOptionPane;

public class Factorial
{

   public static void main(String[] args)
   {
      int fact = 1;

      String numStr;

      numStr = JOptionPane.showInputDialog(
         "Enter a value for n: " );
      int n = Integer.parseInt(numStr);

      while (n > 0)
      {
         fact *= n;
         n--;
      }

      JOptionPane.showMessageDialog(null,
         numStr + "! = " + fact);

      System.exit(0);
   }
}