Java作业 某个数的阶乘

import java.util.Scanner;

public class digui {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		Scanner input = new Scanner(System.in);
		System.out.println("欢迎使用阶乘系统");
		System.out.print("请输入数字n:");
		int n = input.nextInt();
		System.out.println(shu(n));
	}
	public static int shu(int n) {
		int resualt = 1;
		for(int a = n;a > 0;a--) {
			resualt *= a;
		}
		return resualt;
	}
}