第12次作业

作业1:完善menu注册功能,抽奖,看小故事等功能

package d06;

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

public class Menu {
    public static void main(String[] args) {
        mainMenu();
    }

    public static void mainMenu() {
        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("请选择");
        Scanner input = new Scanner(System.in);
        int i = input.nextInt();
        switch (i) {
        case 1:
            login();
            break;
        case 2:
            register();
            break;
        case 3:
            prize();
            break;
        case 4:
            story();
            break;
        case 5:
            quit();
            break;
        default:
            System.out.println("输入有误重新输入");
            mainMenu();
        }

    }

    public 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");
        }
        System.out.println("是否返回主菜单？Y/N");
        if (input.next().equalsIgnoreCase("Y")) {
            mainMenu();
        } else {
            System.out.println("谢谢使用");
        }
    }

    public static void register() {
        Scanner input = new Scanner(System.in);
        System.out.println("请输入所要使用的用户名");
        String uname = input.nextLine();
        System.out.println("输入密码");
        String upwd = input.next();
        System.out.println("再次确认密码");
        String pwd = input.next();
        System.out.println("注册成功");
        System.out.println("是否返回主菜单？Y/N");
        if (input.next().equalsIgnoreCase("Y")) {
            mainMenu();
        } else {
            System.out.println("谢谢使用");
        }
    }

    public static void prize() {
        System.out.println("请输入会员号");
        Random r = new Random();
        int x = r.nextInt(10);
        Scanner input = new Scanner(System.in);
        int hy = input.nextInt();
        if (hy % 1000 / 100 == x) {
            System.out.println("幸运会员");
        } else {
            System.out.println("不是幸运会员");
        }
        System.out.println("是否返回主菜单？Y/N");
        if (input.next().equalsIgnoreCase("Y")) {
            mainMenu();
        } else {
            System.out.println("谢谢使用");
        }
    }

    public static void story() {
        System.out.println("请输入查看的内容");
        Scanner input = new Scanner(System.in);
        input.next();
        System.out.println("谢谢收看");
        System.out.println("是否返回主菜单？Y/N");
        if (input.next().equalsIgnoreCase("Y")) {
            mainMenu();
        } else {
            System.out.println("谢谢使用");
        }
    }

    public static void quit() {
        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 d07;

import java.util.Scanner;

public class factorial {
    int n;

    public void JC() {
        int sum = 1;
        for (int i = 1; i <= n; i++) {
            sum *= i;
        }
        System.out.println("n的阶乘为" + sum);
    }

}

package d07;

public class text9 {

    public static void main(String[] args) {
        // TODO Auto-generated method stub
        factorial a=new factorial();
        a.n=5;
        a.JC();

    }

}

　　　

　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 d07;

import java.util.Scanner;

public class factorial {
    
    public void JC() {
        int sum = 1;
        Scanner input =new Scanner(System.in);
        System.out.println("请输入 n");
        int n=input.nextInt();
        for (int i = 1; i <= n; i++) {
            sum *= i;
        }
        System.out.println("n的阶乘为" + sum);
    }

}

package d07;

public class text9 {

    public static void main(String[] args) {
        // TODO Auto-generated method stub
        factorial a=new factorial();
        a.JC();

    }

}

 3.编写一个方法，判断该年份是平年还是闰年。[必做题]

package d08;

import java.util.Scanner;

public class Year {
    public void year() {
        System.out.println("请输入年份");
        Scanner input = new Scanner(System.in);
        int year = input.nextInt();
        if (year % 4 == 0 && year % 100 != 0 || year % 400 == 0) {
            System.out.println("闰年");
        } else {
            System.out.println("平年");
        }
    }

}

package d08;

public class text10 {

    public static void main(String[] args) {
        // TODO Auto-generated method stub
        Year a = new Year();
        a.year();

    }

}