第八周作业

1.完善menu注册功能,抽奖,看小故事等功能

package test;

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,
就是幸运会员.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:
            zc();
            break;
        case 3:
            lucky();
            break;
        case 4:
            noice();
            break;
        case 5:
            tc();
            break;
        }
    }
    
    private static void tc() {
        System.out.println("是否退出系统?Y/N");
        Scanner input = new Scanner(System.in);
        if (input.next().equalsIgnoreCase("Y")) {
            System.out.println("=====退出系统成功====");
        }else{
            mainMenu();
            
        }
    }
    private static void noice() {
        System.out.println("随机一个小故事");
        returnMain();
    }
    private static void lucky() {
        Scanner input = new Scanner(System.in);
        Random r=new Random();
        int x=r.nextInt(10);
        System.out.println("输入四位会员卡号");
        int u = input.nextInt();
        if(x==u/100%10) {
            System.out.println("是幸运会员!");
        }else {
            System.out.println("不是幸运会员");
        }
        returnMain();
    }
    private static void zc(){
        Scanner input = new Scanner(System.in);
        System.out.println("======注册页面======");
        System.out.println("请输入用户名");
        String uname = input.next();
        System.out.println("输入密码");
        String upwd = input.next();
        System.out.println("======返回登录页面=====");
        login();
    }
    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 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 test;public class Now1 {
    public static void jc (int x) {
        int sum=1;
        for(int i=1;i<=x;i++) {
            sum*=i;
        }    
    System.out.println(x+"阶乘为: "+sum);
    }

    public static void main(String[] args) {
        jc(5);
        
    }
}

 

3.编写一个方法，判断该年份是平年还是闰年。[必做题]

package test;

import java.util.Scanner;

public class Now1 {
    static int year;
    public static void jc (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");
            }
    
    }

    public static void main(String[] args) {
        Scanner in=new Scanner(System.in);
        Now1 r1=new Now1();
        System.out.println("请输入年份: ");
        r1.year=in.nextInt();
        r1.jc(year);
        
    }
    

}