2020.4.24.java第八周作业

1:完善menu注册功能,抽奖,看小故事等功能

package kksk;

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

public class kksk {
    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:
            zhuce();
            break;
        case 3:
            choujiang();
            break;
        case 4 :
            xiaogushi();
            break;
        case 5:
            System.out.println("退出");
            }
    }

    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("ltt") && upwd.equals("123")) {
            System.out.println("登录成功");
        } else {
            System.out.println("登录失败");
        }
        returnMain();
    
    }
    
    public static void zhuce(){
        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();
        System.out.println("注册成功");
        returnMain();
    }
    public static void choujiang() {
        Scanner input = new Scanner(System.in);
        System.out.println("抽奖模式");
        Random r=new Random();
        int sjs=r.nextInt(10);
        System.out.println("请输入四位会员数");
        int num=input.nextInt();
        if(num/100%10==sjs) {
            System.out.println("恭喜你，是幸运会员");
        }else {
            System.out.println("祝你下次好运");
        }
        returnMain();
    }
    public static void xiaogushi() {
        System.out.println("吃菠萝包的方法");
        System.out.println("1.张嘴");
        System.out.println("2.咬下去");
        System.out.println("3.扔皮");
        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。

package kksk;

import java.util.Scanner;

public class kksk {
    public static void main(String[] args){
    int jc=1;
    Scanner sc = new Scanner(System.in);
    System.out.println("请输入一个整数");
    int x=sc.nextInt();
    for(int i=1;i<=x;i++){
        jc*=i;
    }
    System.out.println(x+"的阶乘："+jc);
    }
}
 

3.编写一个方法，判断该年份是平年还是闰年。

package kksk;

import java.util.Scanner;

public class kksk {
    public static void main(String[] args){
    int year;
    Scanner sc = new Scanner(System.in);
    System.out.println(" 输入年份：");
     year= sc.nextInt();
     if(year%4==0&&year%100!=0||year%400==0){
         System.out.println(year+"年是闰年");
     }else{
         System.out.println(year+"年是平年");
     }
    }
}