计算n的阶乘

n的阶乘是 n*(n-1)*(n-2)*……*1

比如5的阶乘是5*4*3*2*1

要求输入数字n，计算n的阶乘

package ch02;

import java.util.Scanner;

public class work19 {
    public static void main(String[] args) {
        Scanner scan = new Scanner(System.in);
        System.out.println("请输入数字：");
        int n = scan.nextInt();
        int sum = 1;
        for (int i = 1; i <= n; i++) {
            sum = sum * i;
        }
        System.out.println(n+"的阶乘："+sum);
    }
}