C TIC TOC game using a multidimensional array It should allo

C++ TIC TOC game using a multidimensional array. It should allow two humans to play together.
Your game must prevent illegal moves and have an option to erase the board to allow for multiple games.

I already craeated the program but im having problem testing the WINNER diagonally and option to ERASE the board and start fresh new game.

Heres my code:

#include <iostream>
using namespace std;

void eraseGameBoard();
void displayBoard();
void playerTurn();
bool gameover();

char turn;
bool draw = false;
char board[3][3] = { { \'1\',\'2\',\'3\'},{ \'4\',\'5\',\'6\'},{ \'7\',\'8\',\'9\'} };

int main()
{
   cout << \"Tic Toc Toe Game\ \";
   cout << \"Player 1 [X] ------ Player 2 [O]\ \";
   turn = \'X\';

   while (!gameover())
   {
       displayBoard();
       playerTurn();
       gameover();
   }

   if (turn == \'O\' && !draw)
   {
       displayBoard();
       cout << endl << endl << \"player 1 [X] Wins! Game Over!\ \";
   }
   else if (turn == \'X\' && !draw)
   {
       displayBoard();
       cout << endl << endl << \"player 2 [O] Wins! Game Over!\ \";
   }
   else
   {
       displayBoard();
       cout << endl << endl << \"It\'s a draw! Game Over!\ \";
   }

return 0;
}

void eraseGameBoard()
{
   cout << endl;
   cout << \" | | \" << endl;
   cout << \" \" << board[0][0] << \" | \" << board[0][1] << \" | \" << board[0][2] << endl;
   cout << \"____|____|____\" << endl;
   cout << \" | | \" << endl;
   cout << \" \" << board[1][0] << \" | \" << board[1][1] << \" | \" << board[1][2] << endl;
   cout << \"____|____|____\" << endl;
   cout << \" | | \" << endl;
   cout << \" \" << board[2][0] << \" | \" << board[2][1] << \" | \" << board[2][2] << endl;
   cout << \" | | \" << endl;
}

void displayBoard()
{
   cout << endl;
   cout << \" | | \" << endl;
   cout << \" \" << board[0][0] << \" | \" << board[0][1] << \" | \" << board[0][2] << endl;
   cout << \"____|____|____\" << endl;
   cout << \" | | \" << endl;
   cout << \" \" << board[1][0] << \" | \" << board[1][1] << \" | \" << board[1][2] << endl;
   cout << \"____|____|____\" << endl;
   cout << \" | | \" << endl;
   cout << \" \" << board[2][0] << \" | \" << board[2][1] << \" | \" << board[2][2] << endl;
   cout << \" | | \" << endl;
}

void playerTurn()
{
int choice;
int row = 0, column = 0;

   if (turn == \'X\')
   {
       cout << \"Player 1 turn [X]: \";
   }
   else if (turn == \'O\')
   {
       cout << \"Player 2 turn [O]: \";
   }
   cin >> choice;

   switch (choice)
   {
       case 1: row = 0; column = 0; break;
       case 2: row = 0; column = 1; break;
       case 3: row = 0; column = 2; break;
       case 4: row = 1; column = 0; break;
       case 5: row = 1; column = 1; break;
       case 6: row = 1; column = 2; break;
       case 7: row = 2; column = 0; break;
       case 8: row = 2; column = 1; break;
       case 9: row = 2; column = 2; break;
       default:
           cout << \"Illegal move! Try again\ \";
           playerTurn();
   }

   if (turn == \'X\' && board[row][column] != \'X\' && board[row][column] != \'O\')
   {
       board[row][column] = \'X\';
       turn = \'O\';
   }
   else if(turn == \'O\' && board[row][column] != \'X\' && board[row][column] != \'O\')
   {
       board[row][column] = \'O\';
       turn = \'X\';
   }
   else
   {
       cout << \"The cell you chose is used! Choose another one\ \";
       playerTurn();
   }
}

bool gameover()
{
   for (int i = 0; i < 3; i++)
   {
       if ((board[i][0] == board[i][1] && board[i][1] == board[i][2]) || (board[0][i] == board[1][i] && board[1][i] == board[2][i]))
       {
           return true;
       }
   }

   for (int i = 0; i < 3; i++)
   {
       for (int j = 0; j < 3; j++)
       {
           if (board[i][j] != \'X\' && board[i][j] != \'O\')
           {
               return false;
           }
       }
   }

draw = true;
return true;
}