const PLAYER   = 1;
const COMPUTER = 2;
const EASY     = 1;
const MEDIUM   = 2;
const HARD     = 3;
const ERROR    = 0;

class TicTacToe {
public:
   TicTacToe (char[][3], int, int, int);
   ~TicTacToe () {delete[] board;};
   void Display ();
   void Make_Move(int&);
   void Player_Move (char,int);
   void Comp_Move (char);
   inline bool Check_Validity (int, int);
   char Evaluate ();

private:
   char board[3][3];
   int level;
   int players;
   int first;
};