package recursion;

import javax.swing.JOptionPane;

public class Factorial 
{
    public double fact(int num)
    {   // base case: how the recursion stops:
        if (num == 1)
            return 1;
        else
            return num * fact(num - 1);
    }
    
    public static void main(String[] args) 
    {   Factorial f = new Factorial();
        int num = 100;
        double result = f.fact(num);
        String msg = num + "! = " + result;
        JOptionPane.showMessageDialog(null, msg);
    }
    
}