Problem with a Factorial Program

Question

I want to write a program that displays the factorial of a number, the problem is that my program doesn't work. Who can help me?? If I enter a number, nothing happens!
import javax.swing.JOptionPane;
public class Homework4_32
     public static void main( String args[] )
     String X;
     int x;
     int y;
int result;
     X = JOptionPane.showInputDialog( "Enter a nonnegative integer" );
     x = Integer.parseInt( X );
     y = x-1;
     do
     result = x * y;
     } while ( x >= 1 );
     JOptionPane.showMessageDialog(
          null, " The result is " +result);
}

Answer 1

try
int result = 1;
x = Integer.parseInt(X);
do
result *= x--;
} while ( x >= 1 );