第八周上机作业

1:完善menu注册功能,抽奖,看小故事等功能

package einht;
import java.util.*;
import java.util.Random;
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("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.println("请选择");
          int i = input.nextInt();
          switch (i){
          case 1:
           login();
           break;
          case 2:
           zhuce();
           break;
          case 3:
           choujiang();
           break;
          case 4:
           story();
           break;
          case 5:
           returnmain();
           break;
          }
         }
         public static void login() {
          Scanner input = new Scanner(System.in);
          System.out.println("输入用户姓名");
          String uname=input.next();
          System.out.println("输入密码");
          String upwd=input.next();
          if(uname.equals("zs")&& upwd.equals("12321")){
           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("注册姓名");
          String zname=input.next();
          System.out.println("注册密码");
          String zpwd=input.next();
          System.out.println("注册成功！");
          returnmain();
         }
         public static void choujiang(){
          Random r=new Random ();
          Scanner input=new Scanner(System.in);
          System.out.println("请输入四位会员号");
          int huiyuan=input.nextInt();
          int bai=huiyuan/100%10;
          int lucky=r.nextInt(10);
          if(bai==lucky){
           System.out.println("您是幸运会员");
          }else{
           System.out.println("您不是幸运会员");
          }
          returnmain();
         }
         public static void story(){
          Scanner input =new Scanner(System.in);
          System.out.println("请选择小故事：1白雪公主 2青蛙王子 3龟兔赛跑    5返回菜单");
          int i=input.nextInt();
          switch (i) {
          case 1:
           bxgz();
           break;
          case 2:
           qwwz();
           break;
          case 3:
           gtsp();
           break;
          case 5:
           returnmain();
          }
          returnmain();
         }
         public static void bxgz(){
          System.out.println("白雪公主和七个小矮人，王子救了白雪公主，最后他们幸福的在一起了。");
         }
         public static void qwwz(){
          System.out.println("巫女下了魔咒，把王子变成了青蛙，公主亲了青蛙，青蛙变回王子，俩人在一起了");
         }
         public static void gtsp(){
          System.out.println("骄傲的兔子输给了谦虚的乌龟");
         }
         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 one;

public class jc {

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

    public static void main(String[] args) {
        System.out.println(jc(6));
    }

}

 

 

 3.编写一个方法，判断该年份是平年还是闰年。[必做题]

package one;

public class run {

    public static void main(String[] args) {
        prn(2020);
    }

    public static void prn(int year) {
        if (year % 4 == 0 && year % 100 != 0 || year % 400 == 0) {
            System.out.println(year + "年是闰年");
        } else {
            System.out.println(year + "年不是闰年");
        }

    }
}