计算阶乘

 1 public static void main(String[] args) {
 2         System.out.println("请输入一个要计算的数：");
 3         Scanner in = new Scanner(System.in);
 4         int a = in.nextInt();
 5         int x = 1;
 6         System.out.print(a+"!=");
 7         for(int i = a;i > 0;i --){
 8             System.out.print(i);
 9             System.out.print("*");
10             x = x*i;
11         }
12         System.out.print("="+x);
13     }