利用递归求阶乘

package com.d;

import java.util.Scanner;

public class Digui {

    public static void main(String[] args) {
        Digui d = new Digui();

        System.out.println("请输入一个整数");
        Scanner scan = new Scanner(System.in);
        int a = scan.nextInt();
        System.out.println(a + "!=" + d.jiecheng(a));
    }

    // 递归求阶乘
    public int jiecheng(int a) {
        if (a == 1 || a == 0) {
            return 1;
        } else {
            return a * jiecheng(a - 1);
        }
    }
}