java第八周作业

1:完善menu注册功能,抽奖,看小故事等功能。

package pro1;
import java.util.Scanner;
import java.util.Random;
public class test {
    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("aa") && 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.搞笑故事");
        System.out.println("2.睡前故事");
        int b = input.nextInt();
        switch (b) {
        case 1:
            System.out.println("hhh");
            break;
        case 2:
            System.out.println("zzz");
            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。

package pro1;
public class test {
    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(jc(5));
    }
}

3.编写一个方法，判断该年份是平年还是闰年。

package pro1;
import java.util.Scanner;
public class test {
     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("该年是闰年");
             }else{
                 System.out.println("该年是平年");
                   }
     }
}