第八周作业

//1:完善menu注册功能,抽奖,看小故事等功能
package com.a03;

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("1.登录");
        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 i = input.nextInt();
        switch (i) {
        case 1:
            login();
            break;
        case 2:
            create();

            break;
        case 3:
            luckly();
            break;
        case 4:
            story();
            break;
        case 5:
            exit();
            break;
        default:
            System.out.println("请在1到5之间的选项选择");
            break;

        }
    }

    private static void create() {
        Scanner input = new Scanner(System.in);
        System.out.println("注册用户名");
        String name = input.next();
        System.out.println("注册新密码");
        String pwd = input.next();
        System.out.println("注册成功");
        returnMain();
    }

    private static void login() {
       

        Scanner input = new Scanner(System.in);
        System.out.println("输入用户名");
        String uname = input.next();
        System.out.println("输入密码");
        String upwd = input.next();
        if (uname.equals("zs") && upwd.equals("123")) {
            System.out.println("登录成功");
        } else {
            System.out.println("登录失败");
        }
        returnMain();

    }

    public static void luckly() {
        Scanner input = new Scanner(System.in);
        int temp = 0;
        for (int i = 0;; i++) {
            System.out.print("请您输入四位的会员卡号：");
            int vipcard = input.nextInt();

            Random r = new Random();
            int n = r.nextInt(1000) + 8999;
            System.out.println("系统生成的随机数为：" + n);
            if (n == vipcard) {
                System.out.println("恭喜您,成为我们的幸运会员！");
            } else {
                System.out.println("很遗憾,谢谢您的参与！");
            }
            returnMain();
        }
    }

    public static void story() {
        for (int i = 0;; i++) {
            Scanner input = new Scanner(System.in);
            int num = input.nextInt();
            switch (num) {
            case 1:
                System.out.println("海底两万年");
                break;
            case 2:
                System.out.println("冰与火之歌");
                break;
            case 3:
                System.out.println("龙族");
                break;
            default:
                System.out.println("超出可选范围！！");
            }
            break;
        }
        returnMain();
    }

    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");
        }
    }

    public static void exit() {
        System.out.println("是否退出该系统?Y/N");
        Scanner input = new Scanner(System.in);
        if (input.next().equalsIgnoreCase("N")) {
            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5*4*3*2*1.
package com.a03;

import java.util.Scanner;

public class test3 {
    public static void main(String[] args) {

        jc();
    }

    public static void jc() {
        int sum = 1;
        Scanner sc = new Scanner(System.in);
        System.out.println("请随机输入一个数");
        Scanner input = new Scanner(System.in);
        int a = input.nextInt();
        for (int i = 1; i <= a; i++) {
            sum = sum * i;
        }
        System.out.println(a + "的阶乘为：" + sum);
    }

}

//3.编写一个方法，判断该年份是平年还是闰年。[必做题]
package com.a03;

import java.util.Scanner;

public class test3 {
    public static void main(String[] args) {

        year();
    }

    public static void year() {

        Scanner input = new Scanner(System.in);
        System.out.println("请输入年份:");
        int n = input.nextInt();
        if (n % 4 == 0 && n % 100 != 0 || n % 400 == 0) {
            System.out.println(n + "年为闰年");
        } else {
            System.out.println(n + "年为平年");
        }
    }

}