denglu

#include<iostream>
using namespace std;
#include<string>
#include<fstream>
#include <conio.h>
#include<string.h>
#include<windows.h>
typedef struct user
        {
           string password;
           string name;
        }user;
void regist()
  {  //注册
     char *password = new char[20];//分配20个字节，然后返回首地址给password,即password可以看做一个20字节的字符数组，即字符串
     string name;
     /*void regist()
 2 {  //注册
 3     char *password = new char[20];//分配20个字节，然后返回首地址给password,即password可以看做一个20字节的字符数组，即字符串
 4     string name;
 5     /*struct user
 6       {
 7          string password;
 8          string name;
 9       };定义的用户结构体*/
     user c;
     ifstream fin;//声明 ifstream 对象
     fin.open("user.txr",ios::in);//关联文件
     cout << "请输入用户名：";
     cin>>name;
     while(fin >> c.name >> c.password)//读取成功返回1
     {
         if(c.name==name)
         {cout << "该用户名已被注册" <<endl;regist();}
     }
     char test ;int i=0;
     cout << "输入密码:";
     while((test=getch())!='\r')
     {
         if(test==8)//ASC2码8为退格
         {
             if(i>0)
                 {
             cout << test << " " << test;
             password[i--]='\0';
             }
         }
         else
         {
             if(i<20)
             {
                 cout << "*" ;
                 password[i]=test;
                 i++;
             }
         }
     }
     password[i] = '\0';
     cout << "再次输入密码" ;
     char *password2 = new char[20];
     i=0;
     while((test=getch())!='\r')
     {
         if(test==8)
         {
             if(i>0)
                 {
                 cout << test << " " << test ;
                 password2[i--]='\0';
             }
         }
            else
         {
             if(i<20)
             {
                 cout << "*";
                 password2[i]=test;
                 i++;
             }
         }
         password2[i]='\0';
     }
       if(strcmp(password,password2)!=0)
     {
 
         cout << "密码两次输入不正确";
         regist();
     }
     else
     {
         cout << "注册成功";
     }
     ofstream fout;
     fout.open("user.txr",ios_base::out|ios_base::app);
     fout.close();//关闭文件连接，但不会删除流
     cout << "三秒后返回登陆界面";
 }
 int main(){
  regist();
  return 0;
 }