断网，断电，无事自找事；

用vs2019编辑的，其他编辑器，视情况修改，运行；

#include<iostream>
//#include<stdlib.h>
using namespace std;
#define rows 3
#define cols 3

//1.开始游戏界面
//2.打印棋盘
//3.用户下棋，判断是否结束（平局或者赢或者输）
//4.电脑下棋判断是否结束（平局或者赢或者输）
//5.game over

//initialize the board of three chess

void initBoard(char board[rows][cols])
{
    for (size_t row = 0; row< rows; ++row)
    {
        for (size_t col = 0; col < cols; ++col)
        {
            board[row][col] = ' ';
        }
    }
}

//print the board of three chess
void printBoard(char board[rows][cols])
{
    cout << " ----- " << endl;
    for (int row = 0; row < rows; ++row)
    {
        cout << '|' << board[row][0] << '|' << board[row][1] << '|' << board[row][2] << '|' << endl;
        cout << " ----- " << endl;
    }
}

//o replace user
//x repalce computer
void userMove(char board[rows][cols])
{
    //1.提醒用户下棋
    //2.判断位置是否正确，“越界or有琪”两种情况；
    //3.合法，判断是否结束，平局或者输了，
    //4.将位置变为'o';
    size_t row = 0, col = 0;

    while (1)
    {
        cout << "please input position:" << endl;

        cin >> row >> col;
        //超出范围
        //if (!(row >= 0 && row < 3) || !(col >= 0 && col < 3))
        if(row>=3||col>=3)
        {
            cout << "your inputs is not in range,please again input" << endl;

            continue;
        }
        //位置被占用
        else if (board[row][col] != ' ')
        {
            cout << "this position already exists,please again unput" << endl;

            continue;
        }
        else
            board[row][col] = 'o';
        break;
    }
}

//computer move
void computerMove(char board[rows][cols])
{
    //1.电脑产生随机数
    //2.判断随机数是否合乎要求
    //3.将位置变为'x'

    while (1)
    {
        int row = rand() % rows, col = rand() % cols;

        if (board[row][col] != ' ')
            continue;
        else
        {
            board[row][col] = 'x';
            break;
        }
    }
}

bool isFull(char board[rows][cols])
{
    for (int row = 0; row < rows; ++row)
    {
        for (int col = 0; col < cols; ++col)
        {
            if (board[row][col] == ' ')
                return false;
        }
    }
    return true;
}

//judge the game whether is over
int checkOver(char board[rows][cols])
{
    //check the rows
    for (int row = 0; row < rows; ++row)
    {
        if (board[row][0] == board[row][1]&&board[row][0] == board[row][2])
            return board[row][0];
    }

    //check the cols
    for (int col = 0; col < cols; ++col)    
    {
        if (board[0][col] == board[1][col] == board[2][col])
            return board[0][col];
    }
    if (board[0][0] == board[1][1] == board[2][2]
        || board[0][2] == board[1][1] == board[2][0])
        return board[1][1];

    //是否已经满了
    if (isFull(board))
        return '1';
    else
        return '0';
}

int main()
{

    system("title smile game");
    system("mode con cols=50 lines=20");
    system("color e2");
    char board[rows][cols];
    initBoard(board);
    char winner = ' ';
    while (1)
    {
        //
        printBoard(board);
        userMove(board);
        system("cls");
        printBoard(board);
        winner = checkOver(board);
        if (winner == '1'||winner=='o'||winner=='x')
            break;

        computerMove(board);
        system("cls");
        printBoard(board);
        winner = checkOver(board);
        if (winner == '1' || winner == 'o' || winner == 'x')
            break;

    }
    printBoard(board);
    if (winner == 'x')
        cout << "winner: computer" << endl;
    else if (winner == 'o')
        cout << "winner: you" << endl;
    else if (winner == '1')
        cout << "dogfall" << endl;
    return 0;
}