第九次作业

1:完善menu注册功能,抽奖,看小故事等功能

ackage calsswork;
import java.util.Scanner;
public class text1 {
     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.抽奖");
                 System.out.println("4.故事");
                 System.out.println("5.退出");
                 System.out.println("请选择");
                 int i = input.nextInt();
                 switch (i) {
                 case 1:
                     dl();
                     break;
                 case 2:
                     zc();
                     break;
                 case 3:
                     cj();
                     break;
                 case 4:
                     gs();
                     break;
                 case 5:
                     tc();
                     break;
                 }
             }
             private static void dl() {
                 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("wk") && upwd.equals("123")) {
                     System.out.println("登录成功");
                 } else {
                     System.out.println("登录失败");
                 }
                 returnMain();
             }
             private static void zc() {
                 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();
             }
             private static void cj() {
                 Scanner input = new Scanner(System.in);
                 System.out.println("请输入会员卡号");
                 int i = input.nextInt();
                 Random r = new Random();
                 int a = r.nextInt(10);
                 if (a == i / 100 % 10) {
                     System.out.println("恭喜你成为幸运会员");
                 } else {
                     System.out.println("谢谢参与");
                 }
                 returnMain();
             }
             private static void gs() {
                 Scanner input = new Scanner(System.in);
                 System.out.println("请选择故事");
                 System.out.println("1.故事");
                 System.out.println("2.故事");
                 int b = input.nextInt();
                 switch (b) {
                 case 1:
                     System.out.println("1");
                     break;
                 case 2:
                     System.out.println("111");
                     break;
                 }
                 returnMain();
             }
             private static void tc() {
                 System.out.println("欢迎下次使用");
             }
             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 calsswork;
import java.util.Scanner;
public class text1 {
        public static int jc(int x) {
            int a = 1;
            for (int i = 1; i <= x; i++) {
                a *= i;
            }
            return a;
        }
        public static void main(String[] args) {
            System.out.println("5的阶乘是："+jc(5));
        }
    }

编写一个方法，判断该年份是平年还是闰年。[必做题]

package calsswork;
import java.util.Scanner;
public class text1 {
     public static void main(String[] args) {
                Scanner sc= new Scanner(System.in);
                   System.out.println("输入年份");  
                   int 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");
                }
            }
        }