第8周作业

1.:完善menu注册功能,抽奖,看小故事等功能

package homework;

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

    public static void main(String[] args) {
        // TODO Auto-generated method stub
       mainMenu();
    }
    public static void mainMenu(){
        Scanner input=new Scanner(System.in);
        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:
            zhuche();
            break;
        case 3:
            huiyuan();
            break;
        case 4:
            gushi();
            break;
        case 5:
            esc();
            break;
        }
    }
    private static void login() {
        // TODO Auto-generated method stub
        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 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 zhuche() {
            Scanner input = new Scanner(System.in);
            System.out.println("设置用户名为：zs");
            String uname = input.next();
            System.out.println("设置密码为：123");
            String upwd = input.next();
            if(uname.equals("zs")&&upwd.equals("123")) {
                System.out.println("注册成功");
                returnMain();
            } else {
                System.out.println("注册失败,请重新设置");
                zhuche();
            }
        }
            public static void huiyuan() {
                Scanner input = new Scanner(System.in);
                System.out.println("请请输入四位数会员号");
                int a = input.nextInt();
                int b=0;
                b=a/100%10;
                Random r=new Random();
                int s=r.nextInt(10);
                System.out.println(s);
                if(b==s) {
                    System.out.println("恭喜您成为幸运会员");
                    returnMain();
                }else {
                    System.out.println("不好意思您不是幸运会员");
                    returnMain();
                }
            }
            public static void gushi() {
                System.out.println("此前有座山，山上有座庙，庙里有个和尚。有一天，一个老和尚对小和尚说······，后续敬请期待！");
            returnMain();
            }
            public static void esc() {
                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 homework;

public class jc {
    public static int jc(int x){
        int sum=1;
        for(int i=1;i<=x;i++){
            sum*=i;
        }
        return sum;
    }

    public static void main(String[] args) {
        // TODO Auto-generated method stub
        System.out.println(jc(5));

    }

}

3.编写一个方法，判断该年份是平年还是闰年。

package homework;

public class jc {

    public static void main(String[] args) {
        // TODO Auto-generated method stub
        prn(2022);
    }
    
    public static void prn(int year){
        if(year%4==0&&year%100!=0||year%400==0){
            System.out.println(year+"是闰年");
        }
        else{
            System.out.println(year+"不是闰年");
            
            
        }

    }

}