//  Factorial_9_9.java  Copyright (c) 2006 Kari Laitinen

//  http://www.naturalprogramming.com

//  2006-02-15   File created.
//  2006-02-15   Last modification.

//  A solution to Exercise 9-9.

//  As this is a program that can receive parameters from
//  the command line, this should be executed in a command
//  prompt window where the command line parameters can
//  be given. It may be difficult, and even impossible, to
//  supply the command line parameters if this program is 
//  executed with a modern development tool such as JCreator
//  or Eclipse.

//  This program will, though, ask for data from the user
//  if no command line parameters are given.

import java.util.* ;

class Factorial_9_9
{
   static void print_factorial( int given_integer ) 
   {
      System.out.print( "\n The factorial of "  +  given_integer
                     +  " is "  +  given_integer  +  "! = " ) ;

      int  calculated_factorial  =  1  ;

      while ( given_integer  >  1 )
      {
         calculated_factorial  =  calculated_factorial  *  given_integer ;

         System.out.print( given_integer  +  "*" ) ;

         given_integer  --  ;
      }

      System.out.print(  "1 = "  +  calculated_factorial ) ;
   }


   public static void main( String[] command_line_parameters )
   {
      Scanner keyboard = new Scanner( System.in ) ;

      int  integer_from_keyboard ;

      if ( command_line_parameters.length  ==  1 )
      {
         integer_from_keyboard  =  
                  Integer.parseInt( command_line_parameters[ 0 ] ) ;
      }
      else
      {
         System.out.print( "\n Type in a positive integer: " ) ;
         integer_from_keyboard = keyboard.nextInt();
      }

      print_factorial( integer_from_keyboard ) ;
   }
}