程序代码：

#include<bits/stdc++.h> 

#include<windows.h>

#include<conio.h>

#define version "1.0"

#define ut 10000000ll

using namespace std;

string usernames,password;

string s;

void delay(long long t)
{
    for (int i=0;i<t;i++);
}

void welcome()
{
    cout<<"城市生活  version"<<version<<"  by WindowsC++工作室"<<endl;
    delay(40*ut);
    for (int i=0;i<=100;i++){
        printf("加载中……   %d%%\r",i);
        delay(2*ut);
    }
    delay(30*ut);
    cout<<endl<<endl<<"加载完成！"<<endl;
    delay(60*ut);
}

void print(string a)
{
    for(int i=0;i<=a.length();++i)
    {
        cout<<a[i];
        Sleep(25);
    }
    Sleep(1000);
    return;
}

int main()
{
    welcome();
    system("cls"); 
    void writelog1();
    writelog1();    
    void signid();
    signid();
    void init();
    init();
    return 0;
}

void writelog1()
{
    FILE*outlog=fopen("D:\\HappyGames\\CL\\1.0\\OC.log","a");
    time_t rawtime;
    struct tm *ptminfo; 
    time(&rawtime);
    ptminfo = localtime(&rawtime);
    fprintf(outlog,"%02d-%02d-%02d %02d:%02d:%02d OPEN\n",ptminfo->tm_year + 1900, ptminfo->tm_mon + 1, ptminfo->tm_mday,ptminfo->tm_hour, ptminfo->tm_min, ptminfo->tm_sec);  
}

void signid()
{
    print("请输入账号，按“Enter”结束(没有账号输入no)：\n");
    getline( cin, s );
    vector<string> users;
    {
        ifstream fin( "D:\\HappyGames\\CL\\1.0\\users.tmp" );
        for( string user; getline(fin,user); )
            users.push_back( user );
    }

    if( (find(users.begin(),users.end(),s) != users.end())||(s=="root") )
    {
        void signpassword();
        signpassword();
    }   
    else if(s=="no") 
    {
        print("前往注册……");
        void zhuce();
        zhuce(); 
    }
    else
    {
        print("对不起，该账号未注册！2秒后前往注册页面……");
        void zhuce();
        zhuce();
    }       
}

void signpassword()
{
    string defini="D:\\HappyGames\\CL\\1.0\\";
    string defi="\\psaawords.tmp";
    defini=defini+s+defi;
    print("你即将登录的账号是：");
    print(s);
    print("输入exit返回上一级！\n"); 
    print("请输入密码，按“Enter”结束：\n");
    string sh;
    getline(cin,sh);
    char a[100000000001];
    for(int i=0;i<=defini.length();i++)
    {
        a[i]=defini[i];
    }
    ifstream passin(a);
    passin>>password;
    if((s=="root")&&(sh=="admin"))
    {
        print("管理系统启动中……"); 
    }
    else if(password==sh)
    {
        print("Hello！");
        print(s);
        print("欢迎来到城市生活！\n");
    }
    else
    {
        print("密码不匹配！" );
        signpassword();
    }
}

void zhuce()
{
    system("cls");
    int nSelect = ::MessageBox(NULL,"欢迎来到注册页面！", "registered", MB_ICONASTERISK);
    print("用户名：\n");
    string sh1;
    getline(cin,sh1) ;
    vector<string> users;
    {
        ifstream fin( "D:\\HappyGames\\CL\\1.0\\users.tmp" );
        for( string user; getline(fin,user); )
            users.push_back( user );
    }

    if(find(users.begin(),users.end(),sh1) != users.end() )
    {
        print("用户名被占用！");
        zhuce(); 
    }
    else if((sh1=="root")||(sh1=="资料学习"))
    {
        print("非法账号！");
        zhuce();
    }
    else
    {
        FILE*zhuceidin=fopen("D:\\HappyGames\\CL\\1.0\\users.tmp","a");
        char aaa[1000000001];
        for(int i=0;i<=sh1.length();i++)
        {
            aaa[i]=sh1[i];
        }
        fprintf(zhuceidin,"%s\n",aaa);
    }
}

void init()
{
    
}