C++ 人机下棋游戏：3x3 棋盘，实现行、列、对角线获胜

下面是一个简单的 C++ 代码示例，实现了人机下棋的功能：

#include <iostream>
#include <vector>
#include <cstdlib>
#include <ctime>

using namespace std;

class Board {
private:
    vector<vector<char>> grid;
    char userSymbol;
    char computerSymbol;
    bool userTurn;
    int size;

public:
    Board(int boardSize) {
        size = boardSize;
        grid.resize(size, vector<char>(size, '*'));
        userTurn = true;
    }

    void setUserSymbol(char symbol) {
        userSymbol = symbol;
        computerSymbol = (symbol == 'X') ? 'O' : 'X';
    }

    void drawBoard() {
        for (int i = 0; i < size; i++) {
            for (int j = 0; j < size; j++) {
                cout << grid[i][j] << ' ';  
            }
            cout << endl;
        }
    }

    bool isGameOver() {
        // Check rows
        for (int i = 0; i < size; i++) {
            if (grid[i][0] != '*' && grid[i][0] == grid[i][1] && grid[i][1] == grid[i][2]) {
                return true;
            }
        }

        // Check columns
        for (int j = 0; j < size; j++) {
            if (grid[0][j] != '*' && grid[0][j] == grid[1][j] && grid[1][j] == grid[2][j]) {
                return true;
            }
        }

        // Check diagonals
        if (grid[0][0] != '*' && grid[0][0] == grid[1][1] && grid[1][1] == grid[2][2]) {
            return true;
        }
        if (grid[0][2] != '*' && grid[0][2] == grid[1][1] && grid[1][1] == grid[2][0]) {
            return true;
        }

        // Check for tie
        for (int i = 0; i < size; i++) {
            for (int j = 0; j < size; j++) {
                if (grid[i][j] == '*') {
                    return false;
                }
            }
        }
        return true;
    }

    bool makeMove(int row, int col) {
        if (row < 0 || row >= size || col < 0 || col >= size || grid[row][col] != '*') {
            return false;
        }

        if (userTurn) {
            grid[row][col] = userSymbol;
        } else {
            grid[row][col] = computerSymbol;
        }
        userTurn = !userTurn;
        return true;
    }

    void computerMove() {
        // Generate a random move for the computer
        srand(time(NULL));
        while (true) {
            int row = rand() % size;
            int col = rand() % size;
            if (grid[row][col] == '*') {
                grid[row][col] = computerSymbol;
                userTurn = !userTurn;
                break;
            }
        }
    }
};

int main() {
    int boardSize;
    cout << "Enter the size of the board: ";
    cin >> boardSize;

    Board board(boardSize);

    char userSymbol;
    cout << "Choose your symbol (X/O): ";
    cin >> userSymbol;

    board.setUserSymbol(userSymbol);

    int turn;
    cout << "Choose your turn (1 - First, 2 - Second): ";
    cin >> turn;

    if (turn == 2) {
        board.computerMove();
    }

    while (!board.isGameOver()) {
        board.drawBoard();
        int row, col;
        cout << "Enter your move (row col): ";
        cin >> row >> col;
        if (!board.makeMove(row, col)) {
            cout << "Invalid move! Try again." << endl;
            continue;
        }

        if (!board.isGameOver()) {
            board.computerMove();
        }
    }

    board.drawBoard();
    cout << "Game over!" << endl;

    return 0;
}

这个代码创建了一个名为Board的类，表示棋盘。它包含了一个二维字符向量来存储棋盘状态。用户可以选择棋盘的大小和自己的棋子符号。游戏通过交替进行用户和计算机的移动来进行。计算机的移动是随机生成的。游戏在每个移动后检查是否有玩家获胜或平局。如果游戏结束，它将显示最终的棋盘状态和游戏结束的消息。