第八周作业

1.:完善menu注册功能,抽奖,看小故事等功能

package yu;

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

public class text {

	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");
        System.out.println("4.看书籍");
        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:
            kandianying();
            break;
        case 5:
            tuichu();
            break;
        }
    }

    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("zs") && upwd.equals("123")) {
            System.out.println("登录成功");
        } else {
            System.out.println("登录失败");
        }
        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");
        }

    }

    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();
        if (uname.equals("zs") && upwd.equals("123")) {
            System.out.println("注册失败");
        } else {
            System.out.println("注册成功");
        }
        returnMain();
    }

    public static void choujiang() {
        Scanner input = new Scanner(System.in);
        System.out.println("输入你的会员号");
        int i = input.nextInt();
        Random r = new Random();
        int j = r.nextInt(10);
        if (i / 100 % 10 == 4) {
            System.out.println("恭喜你获得奖品");
        } else {
            System.out.println("非常遗憾,你没有中奖");
        }
        returnMain();
    }

    public static void kandianying() {
        Scanner input = new Scanner(System.in);
        System.out.println("请选择你要看的书籍:");
        System.out.println("1.大学英语");
        System.out.println("2.大学高数");
        int b = input.nextInt();
        switch (b) {
        case 1:
            System.out.println("大学英语之四六级");
            break;
        case 2:
            System.out.println("大学高数之导数");
            break;
        }
        returnMain();
    }

    public static void tuichu() {
        System.out.println("谢谢使用,欢迎你下次光临");
    }
}

　　

 

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 yu;
 
public class hg {
 
    public static void main(String[] args) {
        // TODO Auto-generated method stub
        // 编写一个方法，求整数n的阶乘，
        jc(5);
    }
 
    public static void jc(int i) {
        int jc = 1;
        for (int j = 1; j <= i; j++) {
          jc*= j;
        }
        System.out.println(i + "的阶乘为" + jc);
    }
}

　　

　　

 

3.编写一个方法，判断该年份是平年还是闰年。[必做题]

 

package yu;
 
public class hg {
 
    public static void main(String[] args) {
        // TODO Auto-generated method stub
        // 编写一个方法，判断该年份是平年还是闰年
        hg(2020);
    }
 
    public static void hg(int year) {
        if (year % 4 == 0 && year % 100 != 0 || (year % 400 == 0)) {
            System.out.println(year + "是闰年");
        } else {
            System.out.println(year + "不是闰年");
        }
    }
}