SAMPLE PROGRAM

class Factorial {
 public static void main(String[] a) {
 System.out.println(new Fac().ComputeFac(10));
 }
}
class Fac {
 public int ComputeFac(int num) {
 int num_aux;
 if (num < 1)
 num_aux = 1;
 else
 num_aux = num * (this.ComputeFac(num-1));
 return num_aux;
 }
}