第八周作业

package bwk;

import java.util.Random;
import java.util.Scanner;
public class Khdw {

    public static void main(String[] args) {
        // TODO Auto-generated method stub
        mainKhdw();
        } 
    
     
    public static void mainKhdw() {
        Scanner input = new Scanner(System.in);
        System.out.println("****************");
        System.out.println("   1. 登录");
        System.out.println("   2. 注册");
        System.out.println("   3.幸运抽奖");
        System.out.println("   4.看小故事");
        System.out.println("   5.退出系统");
        System.out.println("****************");
        System.out.print("请选择:");
        int i = input.nextInt();
        switch (i) {
        case 1:
            login();
            break;
        case 2:
            register();
            break;
        case 3:
            luck();
            break;
        case 4:
            story();
            break;
        case 5:
            exit();
            break;
        default:
            System.out.println("该系统暂未开放其它功能！");
            break;
        }
    }
 
    private static void login() {
        // TODO Auto-generated method stub
        Scanner input = new Scanner(System.in);
        System.out.print("请输入您的用户名：");
        String uname = input.next();
        System.out.print("请输入您的密码：");
        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 returnMain() {
        System.out.println("是否返回主菜单?Y/N");
        Scanner input = new Scanner(System.in);
        if (input.next().equalsIgnoreCase("Y")) {
            mainKhdw();
        } else {
            System.out.println("谢谢使用");
        }
 
    }
 
    public static void register() {
        Scanner input = new Scanner(System.in);
        System.out.print("请输入您的用户名:");
        String uname = input.next();
        System.out.print("请输入您的密码：");
        String upwd = input.next();
        System.out.println("您的账号已注册成功！！！");
        returnMain();
    }
 
    public static void luck() {
        System.out.println("**************************************欢迎来到幸运抽奖界面！*************************************");
        System.out.println(" *******规则为：如果您输入的四位会员卡号的百位等于系统随机数,您将成为我们的幸运会员,否则不是*******");
        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();
            int bai = vipcard % 1000 / 100;
            temp = bai;
            if (vipcard < 999 || vipcard > 9999) {
                System.out.println("您的会员卡号错误,请您重新输入！");
            } else {
                break;
            }
        }
        Random r = new Random();
        int num = r.nextInt(9);
        System.out.println("系统生成的百位随机数为：" + num);
        if (num == temp) {
            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() {
        System.out.println("欢迎您来到小故事界面,请您输入相应的数字(1-3)进行观看！");
        for (int i = 0;; i++) {
            Scanner input = new Scanner(System.in);
            int num = input.nextInt();
            switch (num) {
            case 1:
                System.out.println("男儿事业多，何必学读书 —— 宋 · 张耒《阿几》");
                break;
            case 2:
                System.out.println("阿爷无大儿，木兰无长兄，愿为市鞍马，从此替爷征 —— 南北朝 · 佚名《木兰诗 / 木兰辞》");
                break;
            case 3:
                System.out.println("大儿荷锸去疏麻，小儿提筐来采茶，翁自決水灌秧芽 —— 宋 · 艾性夫《田家词》");
                break;
            default:
                System.out.println("您的输入有错,请重新输入！");
            }
            break;
        }
        returnMain();
    }
 
    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")) {
            mainKhdw();
        } else {
            System.out.println("您已退出我们的系统,谢谢使用!");
        }

    }

}

package bwk;

public class Khdw {


        // TODO Auto-generated method stub
         public static int jc(int a){
        int sum=1;
        for (int i = 1; i <=a; i++) {
            sum*=a;
             
             
        }
        return sum;
    }
    public static void main(String[] args) {
        System.out.println(jc(6));
    }
}

package bwk;

public class Khdw {


        // TODO Auto-generated method stub
    public static void main(String[] args) {
        near(2020);
    }
        public static void near(int y){
             if (y % 4 == 0 && y % 100 != 0 || y % 400 == 0) {
                    System.out.println(y + "年是闰年");
                } else {
                    System.out.println(y + "年不是闰年");
                }
        }
 
}