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#include <iostream>
using namespace std;
enum gamePiece { X_PIECE, O_PIECE, EMPTY_PIECE };
enum gameState { X_WINS, O_WINS, TIE };
char gamePieceChr[3] = { 'X', 'O', ' ' };
const int BEST_MOVE[] = { 4, 0, 2, 6, 8, 1, 3, 5, 7 };
gamePiece Board[] = { EMPTY_PIECE, EMPTY_PIECE, EMPTY_PIECE, EMPTY_PIECE, EMPTY_PIECE, EMPTY_PIECE, EMPTY_PIECE, EMPTY_PIECE, EMPTY_PIECE };
int const HUMAN = 1;
int const COMPUTER = 0;
gamePiece humanPiece;
gamePiece computerPiece;
void printInstructions();
void printBoard();
bool gameWin();
bool isLegal(gamePiece board[], int move);
int getHumanMove();
int getComputerMove();
int main()
{
char yesNo = ' ';
int playerTurn = HUMAN;
char playerMarker = ' ';
int playerMove = 0;
printInstructions();
do
{
cout << "Would you like to go first?(y/n): ";
cin >> yesNo;
yesNo = toupper(yesNo);
if (yesNo != 'Y' && yesNo != 'N')
cout << "Invalid Choice try again." << endl << endl;
} while (yesNo != 'N' && yesNo != 'Y');
switch (yesNo)
{
case 'Y':
playerTurn = HUMAN;
humanPiece = X_PIECE;
computerPiece = O_PIECE;
case 'N':
playerTurn = COMPUTER;
humanPiece = O_PIECE;
computerPiece = X_PIECE;
break;
default: cout << "Invalid Character" << endl;
break;
}
do
{
Board[getHumanMove()] = X_PIECE;
gameWin();
printBoard();
Board[getComputerMove()] = O_PIECE;
gameWin();
printBoard();
}while(!gameWin());
system("pause");
return 0;
}
void printInstructions()
{
cout << "Welcome to the game of Tic-Tac-Toe." << endl << endl;
cout << "Make your move known by entering a number, 0-8. The number " << endl;
cout << "corresponds to the desired board position as shown below." << endl << endl;
cout << " " << "0" << " | " << "1" << " | " << "2" << endl;
cout << " -----+-----+-----" << endl;
cout << " " << "3" << " | " << "4" << " | " << "5" << endl;
cout << " -----+-----+-----" << endl;
cout << " " << "6" << " | " << "7" << " | " << "8" << endl;
}
void printBoard()
{
cout << endl;
cout << " " << gamePieceChr[Board[0]] << " | " << gamePieceChr[Board[1]] << " | " << gamePieceChr[Board[2]] << endl;
cout << " -----+-----+-----" << endl;
cout << " " << gamePieceChr[Board[3]] << " | " << gamePieceChr[Board[4]] << " | " << gamePieceChr[Board[5]] << endl;
cout << " -----+-----+-----" << endl;
cout << " " << gamePieceChr[Board[6]] << " | " << gamePieceChr[Board[7]] << " | " << gamePieceChr[Board[8]] << endl;
}
int getHumanMove()
{
int move;
cout << endl;
cout << "Make your move." << endl;
printBoard();
cout << "Where will you move (0-8): ";
cin >> move;
if (move < 0 || move > 8)
cout << "Invalid choice. Try again.";
return move;
}
int getComputerMove()
{
int move;
cout << "Computer turn." << endl;
// check if computer can win on next move
for (int i = 0; i <= 8; i++)
{
if (Board[i] == EMPTY_PIECE)
{
Board[i] = computerPiece;
if (gameWin())
{
cout << "computer has won";
return i;
}
else {
Board[i] = EMPTY_PIECE;
}
}
}
// check if human can win on next move
for (int i = 0; i <= 8; i++)
{
if (Board[i] == EMPTY_PIECE)
{
Board[i] = humanPiece;
if (gameWin())
{
Board[i] = computerPiece;
return i;
}
else {
Board[i] = EMPTY_PIECE;
}
}
}
//computer can't on next move; human can't win
for (int i = 0; i <= 8; i++)
{
move = BEST_MOVE[i];
if (Board[move] == EMPTY_PIECE)
break;
}
return move;
}
bool isLegal(gamePiece board[], int move)
{
if (move < 0 || move > 8 || board[move] != EMPTY_PIECE)
return false;
return true;
}
bool gameWin()
{
bool winner = false;
if (gamePieceChr[Board[0]] == X_PIECE && gamePieceChr[Board[1]] == X_PIECE && gamePieceChr[Board[2]] == X_PIECE)
winner = true;
if (gamePieceChr[Board[3]] == X_PIECE && gamePieceChr[Board[4]] == X_PIECE && gamePieceChr[Board[5]] == X_PIECE)
winner = true;
if (gamePieceChr[Board[6]] == X_PIECE && gamePieceChr[Board[7]] == X_PIECE && gamePieceChr[Board[8]] == X_PIECE)
winner = true;
if (gamePieceChr[Board[0]] == X_PIECE && gamePieceChr[Board[3]] == X_PIECE && gamePieceChr[Board[6]] == X_PIECE)
winner = true;
if (gamePieceChr[Board[1]] == X_PIECE && gamePieceChr[Board[4]] == X_PIECE && gamePieceChr[Board[7]] == X_PIECE)
winner = true;
if (gamePieceChr[Board[2]] == X_PIECE && gamePieceChr[Board[5]] == X_PIECE && gamePieceChr[Board[8]] == X_PIECE)
winner = true;
if (gamePieceChr[Board[0]] == X_PIECE && gamePieceChr[Board[4]] == X_PIECE && gamePieceChr[Board[8]] == X_PIECE)
winner = true;
if (gamePieceChr[Board[2]] == X_PIECE && gamePieceChr[Board[4]] == X_PIECE && gamePieceChr[Board[6]] == X_PIECE)
winner = true;
if (gamePieceChr[Board[0]] == O_PIECE && gamePieceChr[Board[1]] == O_PIECE && gamePieceChr[Board[2]] == O_PIECE)
winner = true;
if (gamePieceChr[Board[3]] == O_PIECE && gamePieceChr[Board[4]] == O_PIECE && gamePieceChr[Board[5]] == O_PIECE)
winner = true;
if (gamePieceChr[Board[6]] == O_PIECE && gamePieceChr[Board[7]] == O_PIECE && gamePieceChr[Board[8]] == O_PIECE)
winner = true;
if (gamePieceChr[Board[0]] == O_PIECE && gamePieceChr[Board[3]] == O_PIECE && gamePieceChr[Board[6]] == O_PIECE)
winner = true;
if (gamePieceChr[Board[1]] == O_PIECE && gamePieceChr[Board[4]] == O_PIECE && gamePieceChr[Board[7]] == O_PIECE)
winner = true;
if (gamePieceChr[Board[2]] == O_PIECE && gamePieceChr[Board[5]] == O_PIECE && gamePieceChr[Board[8]] == O_PIECE)
winner = true;
if (gamePieceChr[Board[0]] == O_PIECE && gamePieceChr[Board[4]] == O_PIECE && gamePieceChr[Board[8]] == O_PIECE)
winner = true;
if (gamePieceChr[Board[2]] == O_PIECE && gamePieceChr[Board[4]] == O_PIECE && gamePieceChr[Board[6]] == O_PIECE)
winner = true;
return winner;
}
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