java第八周作业
1:完善menu注册功能,抽奖,看小故事等功能。
1 package pro1; 2 import java.util.Scanner; 3 import java.util.Random; 4 public class test { 5 public static void main(String[] args) { 6 mainMenu(); 7 } 8 public static void mainMenu() { 9 Scanner input = new Scanner(System.in); 10 System.out.println("1.登录"); 11 System.out.println("2.注册"); 12 System.out.println("3.抽奖"); 13 System.out.println("4.故事"); 14 System.out.println("5.退出"); 15 System.out.println("请选择"); 16 int i = input.nextInt(); 17 switch (i) { 18 case 1: 19 dl(); 20 break; 21 case 2: 22 zc(); 23 break; 24 case 3: 25 cj(); 26 break; 27 case 4: 28 gs(); 29 break; 30 case 5: 31 tc(); 32 break; 33 } 34 } 35 private static void dl() { 36 Scanner input = new Scanner(System.in); 37 System.out.println("输入用户名"); 38 String uname = input.next(); 39 System.out.println("输入密码"); 40 String upwd = input.next(); 41 if (uname.equals("aa") && upwd.equals("123")) { 42 System.out.println("登录成功"); 43 } else { 44 System.out.println("登录失败"); 45 } 46 returnMain(); 47 } 48 private static void zc() { 49 Scanner input = new Scanner(System.in); 50 System.out.println("输入用户名"); 51 String uname = input.next(); 52 System.out.println("输入密码"); 53 String upwd = input.next(); 54 System.out.println("注册成功"); 55 returnMain(); 56 } 57 private static void cj() { 58 Scanner input = new Scanner(System.in); 59 System.out.println("请输入会员卡号"); 60 int i = input.nextInt(); 61 Random r = new Random(); 62 int a = r.nextInt(10); 63 if (a == i / 100 % 10) { 64 System.out.println("恭喜你成为幸运会员"); 65 } else { 66 System.out.println("谢谢参与"); 67 } 68 returnMain(); 69 } 70 private static void gs() { 71 Scanner input = new Scanner(System.in); 72 System.out.println("请选择故事"); 73 System.out.println("1.搞笑故事"); 74 System.out.println("2.睡前故事"); 75 int b = input.nextInt(); 76 switch (b) { 77 case 1: 78 System.out.println("hhh"); 79 break; 80 case 2: 81 System.out.println("zzz"); 82 break; 83 } 84 returnMain(); 85 } 86 private static void tc() { 87 System.out.println("欢迎下次使用"); 88 } 89 public static void returnMain() { 90 System.out.println("是否返回主菜单?Y/N"); 91 Scanner input = new Scanner(System.in); 92 if (input.next().equalsIgnoreCase("Y")) { 93 mainMenu(); 94 } else { 95 System.out.println("谢谢使用"); 96 } 97 } 98 }
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。
1 package pro1; 2 public class test { 3 public static int jc(int x) { 4 int a = 1; 5 for (int i = 1; i <= x; i++) { 6 a *= i; 7 } 8 return a; 9 } 10 public static void main(String[] args) { 11 System.out.println(jc(5)); 12 } 13 }
3.编写一个方法，判断该年份是平年还是闰年。
1 package pro1; 2 import java.util.Scanner; 3 public class test { 4 public static void main(String[] args) { 5 Scanner sc= new Scanner(System.in); 6 System.out.println("输入年份"); 7 int year=sc.nextInt(); 8 if(year%4==0&&year%100!=0||year%400==0){ 9 System.out.println("该年是闰年"); 10 }else{ 11 System.out.println("该年是平年"); 12 } 13 } 14 }
