第八周作业

1.完善Menu 注册功能 ,实现所有功能

  1 package method;
  2 
  3 import java.util.Random;
  4 import java.util.Scanner;
  5 
  6 public class Menu {
  7 
  8     public static void main(String[] args) {
  9         mainMenu();
 10     }
 11 
 12     public static void mainMenu() {
 13         Scanner input = new Scanner(System.in);
 14         System.out.println("1.登录");
 15         System.out.println("2.注册");
 16         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.");
 17         System.out.println("4.看小故事,");
 18         System.out.println("5.退出系统");
 19         System.out.println("请选择");
 20         int i = input.nextInt();
 21         switch (i) {
 22         case 1:
 23             login();
 24             break;            
 25         case 2:
 26             registered();
 27             break;
 28         case 3:
 29             luck();
 30             break;
 31         case 4:
 32             story();
 33             break;
 34         case 5:
 35             outs();
 36             break;
 37         }
 38       
 39     }
 40 
 41     private static void login() {
 42         Scanner input = new Scanner(System.in);
 43         System.out.println("输入用户名");
 44         String uname = input.next();
 45         System.out.println("输入密码");
 46         String upwd = input.next();
 47         if (uname.equals("zs") && upwd.equals("123")) {
 48             System.out.println("登录成功");
 49         } else {
 50             System.out.println("登录失败");
 51         }
 52         returnMain();
 53 
 54     }
 55     
 56     public static void registered(){
 57         Scanner input = new Scanner(System.in);
 58         System.out.println("注册用户名");
 59         String newname = input.next();
 60         String n = newname;
 61         System.out.println("注册密码");
 62         String newpwd = input.next();
 63         String p = newpwd;
 64         if (newname.equals(n) && newpwd.equals(p)) {
 65             System.out.println("注册成功");
 66         } else {
 67             System.out.println("注册失败");
 68         }
 69         returnMain();
 70         
 71     }
 72     
 73     
 74     public static void luck(){
 75         Scanner input = new Scanner(System.in);
 76         Random r = new Random();
 77         int x = r.nextInt(10);        
 78         System.out.print("请输入会员编号:");
 79         int i = input.nextInt();
 80         System.out.println("系统的百位随机数是" + x);
 81         if (i < 1000) {
 82             System.out.println(i + "您的会员编号不合法");
 83         } else if ((i % 1000 / 100) == x) {
 84             System.out.println(i + "恭喜您是幸运会员");
 85         } else {
 86             System.out.println(i + "很抱歉您不是幸运会员");
 87         }
 88         returnMain();
 89     }
 90 
 91     
 92     public static void story(){
 93         System.out.println("1.青蛙王子故事");
 94         System.out.println("2.白雪公主故事");       
 95         System.out.println("3.返回主菜单");
 96         System.out.println("请选择");
 97         Scanner input = new Scanner(System.in);
 98         int i = input.nextInt();
 99         switch (i) {
100         case 1:
101             System.out.println("很久以前有一位王子........");
102             returnMain();
103             break;
104         case 2:
105             System.out.println("很久以前有一位公主........");
106             returnMain();
107             break;
108         case 3: 
109             returnMain();
110             break;
111         }
112     }
113     
114     
115     
116     public static void outs(){
117         
118         System.out.println("谢谢使用");
119         
120     }
121     
122     public static void returnMain() {
123         System.out.println("是否返回主菜单?Y/N");
124         Scanner input = new Scanner(System.in);
125         if (input.next().equalsIgnoreCase("Y")) {
126             mainMenu();
127         } else {
128             System.out.println("谢谢使用");
129         }
130 
131     }
132 
133 }

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]

 1 package method;
 2 
 3 public class Jc {
 4 
 5     public static void main(String[] args) {
 6         
 7         // TODO Auto-generated method stub
 8         int sum = getSum(5);
 9         System.out.println(sum);
10 
11     }
12     public static int getSum(int num){
13         if(num == 1){
14             return 1;
15         }
16         return num*getSum(num-1) ;
17         
18     }
19 
20 }

3.编写一个方法，判断该年份是平年还是闰年。[必做题]

 1 package method;
 2 
 3 import java.util.Scanner;
 4 
 5 public class Runnian {
 6 
 7     public static void main(String[] args) {
 8         Scanner input = new Scanner(System.in);
 9         System.out.println("请输入年份");
10         int a = input.nextInt();
11         Text (a);
12         
13     }
14      public static void Text(int year) {
15             if (year % 4 == 0 && year % 100 != 0 || year % 400 == 0) {
16                 System.out.println(year + "是闰年");
17             } else {
18                 System.out.println(year + "不是闰年");
19             }
20         }
21 
22 }