public class Test {
  public static void main(String args[]) {
   int x = 5;
   int rs = Fac(x);

   System.out.println("" + x + "! = " + rs);
  }

  public static long Fac(int x) { /*阶乘算法*/
   if (x > 1)
    return (x * Fac(x - 1)); /*递归*/
   else
    return 1;
}
}

public class Test {
  public static void main(String args[]) {
   int x = 5;
   int rs = Fac(x);

   System.out.println("" + x + "! = " + rs);
  }

  public static long Fac(int x) { /*阶乘算法*/
   if (x > 1)
    return (x * Fac(x - 1)); /*递归*/
   else
    return 1;
}
}