这是一个原创C++代码，大家可以免费使用，以后也会经常更新，但是禁止抄袭、搬运等，原创@，大家可以提出意见，发讨论，在讨论里@我就行

目前代码功能：

1.登录，注册
2.猜数字
3.石头剪刀布
4.计算器
5.AI五子棋模式
6.双人五子棋模式

注：登录，注册功能直接保存到本地,可以永久使用！！！

代码如下，直接Ctrl+C，Ctrl+V就行

/*
开发者：故渊（才译翔）
协助开发：（想成为者@才译翔，UID：2430）
*/

#include <iostream>
#include <fstream>
#include <map>
#include <cstdlib>
#include <ctime>
using namespace std;

map<string, string> users;

void load_users() {
    ifstream fin("users.txt");
    string username, password;
    while (fin >> username >> password) {
        users[username] = password;
    }
    fin.close();
}

void save_users() {
    ofstream fout("users.txt");
    for (auto &p : users) {
        fout << p.first << " " << p.second << endl;
    }
    fout.close();
}

void guess_number() {
    srand((unsigned)time(0));
    int secret = rand() % 100 + 1, guess, cnt = 0;
    cout << "猜数字游戏：我想了一个1~100的数字。\n";
    while (true) {
        cout << "请输入你的猜测：";
        cin >> guess;
        cnt++;
        if (guess == secret) {
            cout << "恭喜你，猜对了！共猜了" << cnt << "次。\n";
            break;
        } else if (guess < secret) {
            cout << "太小了。\n";
        } else {
            cout << "太大了。\n";
        }
    }
}

void rock_paper_scissors() {
    srand((unsigned)time(0));
    string choice[3] = {"石头", "剪刀", "布"};
    int user, computer;
    cout << "石头剪刀布游戏（0-石头，1-剪刀，2-布）：";
    cin >> user;
    computer = rand() % 3;
    cout << "你出的是：" << choice[user] << endl;
    cout << "电脑出的是：" << choice[computer] << endl;
    if (user == computer) cout << "平局！\n";
    else if ((user == 0 && computer == 1) || (user == 1 && computer == 2) || (user == 2 && computer == 0))
        cout << "你赢了！\n";
    else cout << "你输了！\n";
}

void calculator() {
    double a, b;
    char op;
    cout << "计算器：请输入表达式（如 2 + 3）：";
    cin >> a >> op >> b;
    if (op == '+') cout << "结果：" << a + b << endl;
    else if (op == '-') cout << "结果：" << a - b << endl;
    else if (op == '*') cout << "结果：" << a * b << endl;
    else if (op == '/') {
        if (b == 0) cout << "除数不能为0！\n";
        else cout << "结果：" << a / b << endl;
    } else cout << "不支持的运算符！\n";
}

// 五子棋相关
const int SIZE = 15;
char board[SIZE][SIZE];

void print_board() {
    cout << "   ";
    for (int i = 0; i < SIZE; ++i) cout << (i < 10 ? " " : "") << i << " ";
    cout << endl;
    for (int i = 0; i < SIZE; ++i) {
        cout << (i < 10 ? " " : "") << i << " ";
        for (int j = 0; j < SIZE; ++j) {
            cout << (board[i][j] == 0 ? '.' : board[i][j]) << "  ";
        }
        cout << endl;
    }
}

bool check_win(int x, int y, char c) {
    int dx[] = {1, 0, 1, 1}, dy[] = {0, 1, 1, -1};
    for (int d = 0; d < 4; ++d) {
        int cnt = 1;
        for (int k = 1; k < 5; ++k) {
            int nx = x + dx[d] * k, ny = y + dy[d] * k;
            if (nx < 0 || nx >= SIZE || ny < 0 || ny >= SIZE) break;
            if (board[nx][ny] == c) cnt++;
            else break;
        }
        for (int k = 1; k < 5; ++k) {
            int nx = x - dx[d] * k, ny = y - dy[d] * k;
            if (nx < 0 || nx >= SIZE || ny < 0 || ny >= SIZE) break;
            if (board[nx][ny] == c) cnt++;
            else break;
        }
        if (cnt >= 5) return true;
    }
    return false;
}

void init_board() {
    for (int i = 0; i < SIZE; ++i)
        for (int j = 0; j < SIZE; ++j)
            board[i][j] = 0;
}

void gomoku_pvp() {
    init_board();
    cout << "五子棋-双人模式，玩家1(X)  玩家2(O)\n";
    int turn = 0;
    while (true) {
        print_board();
        int x, y;
        cout << "玩家" << (turn % 2 + 1) << "(" << (turn % 2 == 0 ? 'X' : 'O') << ")请输入落子坐标(行 列)：";
        cin >> x >> y;
        if (x < 0 || x >= SIZE || y < 0 || y >= SIZE || board[x][y]) {
            cout << "无效落子，请重新输入。\n";
            continue;
        }
        board[x][y] = (turn % 2 == 0 ? 'X' : 'O');
        if (check_win(x, y, board[x][y])) {
            print_board();
            cout << "玩家" << (turn % 2 + 1) << "获胜！\n";
            break;
        }
        turn++;
        if (turn == SIZE * SIZE) {
            print_board();
            cout << "平局！\n";
            break;
        }
    }
}

void gomoku_ai() {
    init_board();
    cout << "五子棋-AI模式，你是X，AI是O\n";
    int turn = 0;
    while (true) {
        print_board();
        int x, y;
        if (turn % 2 == 0) {
            cout << "请你输入落子坐标(行 列)：";
            cin >> x >> y;
            if (x < 0 || x >= SIZE || y < 0 || y >= SIZE || board[x][y]) {
                cout << "无效落子，请重新输入。\n";
                continue;
            }
            board[x][y] = 'X';
            if (check_win(x, y, 'X')) {
                print_board();
                cout << "你赢了！\n";
                break;
            }
        } else {
            // 简单AI：随机落子
            do {
                x = rand() % SIZE;
                y = rand() % SIZE;
            } while (board[x][y]);
            board[x][y] = 'O';
            cout << "AI落子：" << x << " " << y << endl;
            if (check_win(x, y, 'O')) {
                print_board();
                cout << "AI赢了！\n";
                break;
            }
        }
        turn++;
        if (turn == SIZE * SIZE) {
            print_board();
            cout << "平局！\n";
            break;
        }
    }
}

void game_menu() {
    while (true) {
        cout << "\n请选择游戏：\n1. 猜数字\n2. 石头剪刀布\n3. 计算器\n4. 五子棋-双人\n5. 五子棋-AI\n6. 退出\n";
        int sel;
        cin >> sel;
        if (sel == 1) guess_number();
        else if (sel == 2) rock_paper_scissors();
        else if (sel == 3) calculator();
        else if (sel == 4) gomoku_pvp();
        else if (sel == 5) gomoku_ai();
        else if (sel == 6) break;
        else cout << "无效选择。\n";
    }
}

int main() {
    // 显示版权信息
    cout << "开发者：故渊（才译翔）\n";
    cout << "协助开发：（想成为者@才译翔，UID：2430）\n";
    cout << "协助开发人员：曹莫凡（UID：1619）\n\n";

    load_users();
    int choice;
    cout << "1. 注册\n2. 登录\n请选择：";
    cin >> choice;
    string username, password;
    bool login = false;
    if (choice == 1) {
        cout << "请输入用户名：";
        cin >> username;
        if (users.count(username)) {
            cout << "用户名已存在！\n";
        } else {
            cout << "请输入密码：";
            cin >> password;
            users[username] = password;
            save_users();
            cout << "注册成功！\n";
            login = true;
        }
    } else if (choice == 2) {
        cout << "请输入用户名：";
        cin >> username;
        cout << "请输入密码：";
        cin >> password;
        if (users.count(username) && users[username] == password) {
            cout << "登录成功！\n";
            login = true;
        } else {
            cout << "用户名或密码错误！\n";
        }
    } else {
        cout << "无效选择。\n";
    }
    if (login) {
        game_menu();
    }
    return 0;
}

代码到此结束，谢谢！！！