作业第十章

一.幸运抽奖
package cn.jbit.myshopping;

import java.util.Scanner;

public class lianxi2 {
public static void main(String[] args) {
String answer =”“;
String name = “”; // 用户名
String mima = “”; // 密码
int cardNumber = 0; // 卡号
int max=9999;
int min=1000;
boolean zhuche= false; // 标识是否注册
boolean denglu = false;//标识是否登录
Scanner input=new Scanner(System.in);
do{
System.out.println(“*欢迎进入奖客富翁抽奖系统”);
System.out.println(“\t\t1.注册”);
System.out.println(“\t\t2.登录”);
System.out.println(“\t\t3.抽奖”);
System.out.println(“**************************”);
System.out.print(“请选择菜单:”);
int num=input .nextInt();
switch (num) {
case 1:
System.out.println(“[奖客富翁系统]>注册”);
System.out.println(“请填写个人注册信息”);
System.out.print(“用户名:”);
name=input.next();
System.out.print(“密码:”);
mima=input.next();
cardNumber=(int)(Math.random()*(max-min))+min;
System.out.println(“注册成功，请记好你的会员卡号”);
System.out.println(“用户名\t密码\t会员卡号”);
System.out.println(name+”\t”+mima+”\t”+cardNumber);
zhuche = true;
break;
case 2:
System.out.println(“[奖客富翁系统]>登录”);
if(zhuche){
for (int i = 1; i<3; i++) {
System.out.print(“请输入用户名:”);
String inputname =input.next();
System.out.print(“请输入密码:”);
String inputmima =input.next();
if (name.equals(inputname)&& inputmima.equals(inputmima)) {
System.out.println(“\n欢迎您：” + inputname);
denglu = true; // 登录成功，标志位设置为true
break;
} else if (i < 3) {
System.out.println(“用户名或密码错误，还有” + (3 - i) + “次机会！”);
} else {
System.out.println(“您3次均输入错误！”);
}
}
} else {
System.out.println(“请先注册，再登录！”);
}
break;
case 3:
System.out.println(“[奖客富翁系统]>抽奖”);
if (!denglu) { // 判断是否登录
System.out.println(“请先登录，再抽奖！”);
System.out.print(“继续吗?（y/n）:”);
answer = input.next();
} else {
//生成5个4位随机数字，并保存在数组中
int[] xinyun= new int[5];
for(int i = 0; i < xinyun.length; i++){
xinyun[i] = (int)(Math.random()*(max-min))+min;
}
System.out.print(“请输入您的卡号：”);
int yourcard = input.nextInt();
int i;
System.out.print(“\n本日的幸运数字为：”);
for (i = 0; i < xinyun.length; i++) {
System.out.print(xinyun[i] + ” “);
}
for (i = 0; i < xinyun.length; i++) {
if (xinyun[i] == yourcard) {
System.out.println(“\n恭喜！您是本日的幸运会员！”);
break;
}
}
if (i == xinyun.length) {
System.out.println(“\n抱歉！您不是本日的幸运会员！”);
}
}
break;
default:
System.out.println(“[您的输入有误！]”);
break;
}
System.out.print(“继续吗?(y/n):”);
answer=input.next();
}while(“y”.equals(answer));
if(“n”.equals(answer)){
System.out.println(“系统退出，谢谢使用”);
}
}

}