第八周作业

1.完善menu注册功能,抽奖,看小故事等功能

package method;

import java.util.Random;
import java.util.Scanner;

public class Menu {
    public static void main(String[] args) {
        mainMenu();
    }

    public static void mainMenu() {
        Scanner input = new Scanner(System.in);
        System.out.println("欢迎使用本系统！！！！！！");
        System.out.println("1.登入");
        System.out.println("2.注册");
        System.out.println("3.幸运抽奖");// 输入四位会员卡号,如果百位等于系统随机数,就是星运会员.否则不是
        System.out.println("4.看小故事");
        System.out.println("5.退出系统");
        System.out.println("请选择：");
        int a = input.nextInt();
        switch (a) {
        case 1:
            login();
            break;
        case 2:
            register();
            break;
        case 3:
            luck();
            break;
        case 4:
            lookstory();
            break;
        case 5:
            off();
            break;
        default:
            break;
        }
    }

    private static void login() {
        Scanner input = new Scanner(System.in);
        System.out.println("输入用户名：");
        String youName = input.next();
        System.out.println("输入密码：");
        String password = input.next();
        if (youName.equals("qsf") && password.equals("123321")) {
            System.out.println("登录成功");
        } else {
            System.out.println("登录失败");
        }
        returnMain();
    }

    private static void register() {
        Scanner input = new Scanner(System.in);
        System.out.println("输入昵称：");
        String jName = input.next();
        System.out.println("输入密码：");
        String password = input.next();
        System.out.println("注册成功");
        returnMain();
    }

    private static void luck() {
        Scanner input = new Scanner(System.in);
        System.out.println("请输入五位会员卡号：");
        int b = input.nextInt();
        Random sj = new Random();
        int x = sj.nextInt(10);
        if (b / 100 % 10 == x) {
            System.out.println("恭喜您中奖了");
        } else {
            System.out.println("谢谢参与");
        }
        returnMain();
    }

    private static void lookstory() {
        Scanner input = new Scanner(System.in);
        System.out.println("请选择想看的故事：");
        System.out.println("1.喜羊羊与灰太狼");
        System.out.println("2.惊雷");
        System.out.println("3.小兵张嘎");
        int c = input.nextInt();
        switch (c) {
        case 1:
            System.out.println("一群小羊与一只灰狼展开的故事。");
            break;
        case 2:
            System.out.println("是最近很火的一首喊麦歌曲，原创演唱者：MC六道。");
            break;
        case 3:
            System.out.println("讲述了小嘎子在老钟叔等的引导下，成为一名八路战士的过程。");
            break;
        default:
            break;
        }
        returnMain();
    }

    public static void off() {
        System.out.println("已经退出系统");
    }

    public static void returnMain() {
        System.out.println("是否返回主菜单?Y/N");
        Scanner input = new Scanner(System.in);
        if (input.next().equalsIgnoreCase("Y")) {
            mainMenu();
        } else {
            System.out.println("谢谢使用");
        }
    }
}

 2.编写一个方法，求整数n的阶乘，例如5的阶乘是1*2*3*4*5。 [必做题]

package Svd;

import java.util.*;

public class bbt {

    public static void main(String[] args) {
        // TODO Auto-generated method stub
        int a = 1;
        Scanner sc = new Scanner(System.in);
        System.out.println("请输入一个数:");
        int x = sc.nextInt();
        for (int i = 1; i <= x; i++) {
            a *= i;
        }
        System.out.println(x + "的阶乘为：" + a);
    }
}

 3.编写一个方法，判断该年份是平年还是闰年。[必做题]

package Svd;

import java.util.*;

public class bbt {

    public static void main(String[] args) {

        Scanner input = new Scanner(System.in);

        System.out.println("请输入年份：");
        int a = input.nextInt();
        if (a % 4 == 0 && a % 100 != 0 || a % 400 == 0) {
            System.out.println(a + "是闰年");
        } else {
            System.out.println(a + "是平年");
        }
    }

}