OOP TicTacToe

#include <iostream>

using namespace std;


class TicTacToe {
public:
    TicTacToe() { }
    ~TicTacToe() {}
    int playerWins;
    bool isDraw;
    void draw_board(char board[])
    {
        cout << board[0] << " " << board[1] << " " << board[2] << endl;
        cout << "-+-+-" << endl;
        cout << board[3] << " " << board[4] << " " << board[5] << endl;
        cout << "-+-+-" << endl;
        cout << board[6] << " " << board[7] << " " << board[8] << endl;

    }
    void clearScreen(){
        for (int i = 0; i < 50; i++)
            cout << endl;
    }
    bool isGameOver(char board[])
    {
        if (board[0] == 'X' && board[1] == 'X' && board[2] == 'X' || board[0] == 'X' && board[3] == 'X' && board[6] == 'X' || board[3] == 'X' && board[4] == 'X' && board[5] == 'X'
            || board[6] == 'X' && board[7] == 'X' && board[8] == 'X' || board[1] == 'X' && board[4] == 'X' && board[7] == 'X' || board[2] == 'X' && board[5] == 'X' && board[8] == 'X'
            || board[0] == 'X' && board[4] == 'X' && board[8] == 'X' || board[2] == 'X' && board[4] == 'X' && board[6] == 'X') {
            this->playerWins = 1;
            return true;
        }
        else if (board[0] == 'O' && board[1] == 'O' && board[2] == 'O' || board[0] == 'O' && board[3] == 'O' && board[6] == 'O' || board[3] == 'O' && board[4] == 'X' && board[5] == 'O'
            || board[6] == 'O' && board[7] == 'O' && board[8] == 'O' || board[1] == 'O' && board[4] == 'O' && board[7] == 'O' || board[2] == 'O' && board[5] == 'X' && board[8] == 'O'
            || board[0] == 'O' && board[4] == 'O' && board[8] == 'O' || board[2] == 'O' && board[4] == 'O' && board[6] == 'O') {
            this->playerWins = 2;
            return true;
        }
        else {
            isDraw = true;
        }
        return false;
    }

};

int main() {
    TicTacToe classhandler;
    int playerTurn = 1;
    char playerMark, choice;
    char board[] = { '1', '2', '3', '4', '5', '6', '7', '8', '9' };
    do {
        classhandler.clearScreen();
        classhandler.draw_board(board);
        if (playerTurn == 1)
        {
            playerMark = 'X';
        }
        else if (playerTurn == 2)
        {
            playerMark = 'O';
        }
        cout << "Player " << playerTurn << ": ";
        cin >> choice;
        switch (choice)
        {
        case '1':
            if (playerTurn == 1)
            {
                board[0] = playerMark;
                playerTurn = 2;
            }
            else if (playerTurn == 2)
            {
                board[0] = playerMark;
                playerTurn = 1;
            }
            break;
        case '2':
            if (playerTurn == 1)
            {
                board[1] = playerMark;
                playerTurn = 2;
            }
            else if (playerTurn == 2)
            {
                board[1] = playerMark;
                playerTurn = 1;
            }
            break;
        case '3':
            if (playerTurn == 1)
            {
                board[2] = playerMark;
                playerTurn = 2;
            }
            else if (playerTurn == 2)
            {
                board[2] = playerMark;
                playerTurn = 1;
            }
            break;
        case '4':
            if (playerTurn == 1)
            {
                board[3] = playerMark;
                playerTurn = 2;
            }
            else if (playerTurn == 2)
            {
                board[3] = playerMark;
                playerTurn = 1;
            }
            break;
        case '5':
            if (playerTurn == 1)
            {
                board[4] = playerMark;
                playerTurn = 2;
            }
            else if (playerTurn == 2)
            {
                board[4] = playerMark;
                playerTurn = 1;
            }
            break;
        case '6':
            if (playerTurn == 1)
            {
                board[5] = playerMark;
                playerTurn = 2;
            }
            else if (playerTurn == 2)
            {
                board[5] = playerMark;
                playerTurn = 1;
            }
            break;
        case '7':
            if (playerTurn == 1)
            {
                board[6] = playerMark;
                playerTurn = 2;
            }
            else if (playerTurn == 2)
            {
                board[6] = playerMark;
                playerTurn = 1;
            }
            break;
        case '8':
            if (playerTurn == 1)
            {
                board[7] = playerMark;
                playerTurn = 2;
            }
            else if (playerTurn == 2)
            {
                board[7] = playerMark;
                playerTurn = 1;
            }
            break;
        case '9':
            if (playerTurn == 1)
            {
                board[8] = playerMark;
                playerTurn = 2;
            }
            else if (playerTurn == 2)
            {
                board[8] = playerMark;
                playerTurn = 1;
            }
            break;
        default:
            break;
        }
    } while (!classhandler.isGameOver(board));
    classhandler.clearScreen();
    classhandler.draw_board(board);
    if (classhandler.playerWins = 1)
    {
        cout << "Game Over! Player One Wins!" << endl;
    }
    else if (classhandler.playerWins = 2)
    {
        cout << "Game Over! Player Two Wins!" << endl;
    }
    else {
        cout << "Game Over! Its a draw!" << endl;
    }
    system("pause");
    return 0;
}