第六次作业

//1:完善menu注册功能,抽奖,看小故事等功能
package homework6.Menu;

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

public class Menu {

	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,输入四位会员卡号,如果百位等于系统随机数,就是星运会员.否则不是.");
		System.out.println("4.看小故事,");
		System.out.println("5.退出系统");
		System.out.print("请选择:");
		int i = input.nextInt();
		switch (i) {
		case 1:
			login();
			break;
		case 2:
			register();
            break;
        case 3:
        	award();
            break;
        case 4 :
            story();
            break;
        case 5:
            System.out.println("退出");
		}
	}

	private static void login() {
		System.out.println("登录");
		Scanner input = new Scanner(System.in);
		System.out.print("输入用户名:");
		String uname = input.next();
		System.out.print("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 register(){
		System.out.println("注册");
        Scanner input = new Scanner(System.in);
        System.out.print("输入用户名:");
        String uname = input.next();
        System.out.print("输入密码:");
        String upwd = input.next();
        System.out.print("注册成功!");
        returnMain();
    }
	
    public static void award() {
        Scanner input = new Scanner(System.in);
        System.out.println("马上进行抽奖...");
        Random r = new Random();
        int awa = r.nextInt(10);
        System.out.print("请输入四位会员卡号:");
        int num = input.nextInt();
        if(num/100%10 == awa) {
            System.out.println("您幸运的成为会员!");
        }else {
            System.out.println("祝你下次好运!");
        }
        returnMain();
    }
    
    public static void story() {
    	Scanner input = new Scanner(System.in);
        System.out.println("目录");
        System.out.println("1.西游记");
        System.out.println("2.红楼梦");
        System.out.println("3.水浒传");
        System.out.println("4.三国演义");
        System.out.print("输入您想看书的序号：");
        int s = input.nextInt();        
        switch (s) {
        case 1:
            System.out.println("欢迎观看---西游记");
            break;
        case 2:
            System.out.println("欢迎观看---红楼梦");
            break;
        case 3:
            System.out.println("欢迎观看---水浒传");
            break;
        default:
        	System.out.println("欢迎观看---三国演义");
            break;
        }
        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");
		}

	}
}

　　

//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 homework6.Menu;

import java.util.Scanner;

public class Code1 {

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

    public static void main(String[] args) {
         Scanner input = new Scanner(System.in);
         System.out.print("输入一个数:");
         int i = input.nextInt();
         System.out.println(i + "的阶层为:" + jc(i));
        
    }
}

　　

//3.编写一个方法，判断该年份是平年还是闰年。[必做题]
package homework6.Menu;

import java.util.Scanner;

public class Code2 {

	public static void year(int n) {
	    if (n % 4 == 0 && n % 100 != 0 || n % 400 == 0) {
	        System.out.println(n + "年是闰年");
	    } else {
	        System.out.println(n + "年不是闰年");
	    }
	}
	
	public static void main(String[] args) {
        Scanner input = new Scanner(System.in); 
        System.out.print("输入一个年份:");       
        int a = input.nextInt();        
        year(a);
    }
}