// calculating factorials using a "for" loop
import javax.swing.JOptionPane;
public class Factorials {
   public static void main( String[] args )
   {
		int number, index;      /*this will work up to 16*/
		int result = 1;

    	// Prompt the user to enter the number to caluclate
    	String numString1 = JOptionPane.showInputDialog(null, 
      	"Enter an integer from 2 - 16 ", "Input Number Window", 
      	JOptionPane.QUESTION_MESSAGE);
    
    	// Convert the string into an int value
    	number = Integer.parseInt(numString1);

		if (number > 1 && number < 17)
		{
			for (index = 1; index <= number; index++)
			{
				result = result * index;
			}
			System.out.println("The factorial is " + result);
		}
		else
		{
			System.out.println(number + " is not a valid number for this computation.");
		}

      	System.exit( 0 );   
   } // end main
} // end of program