tic tac toe.cpp

#include <iostream>
#include <string>
#include <vector>

using namespace std;

const int ROWS = 3, COLUMNS = 3;

void introAndRules();

void drawBoard(const vector<vector<char>>& board);

void game(char player, vector<vector<char>> board);

void playerTurn(char player, vector<vector<char>>& board);

char getMove();

bool validMove(char move, const vector<vector<char>>& board);

void updateBoard(char player, char move, vector<vector<char>>& board);

char gameStatus(char player, const vector<vector<char>>& board);

int main()
{
	// Setup:

	vector<vector<char>> board = 
	{
		{'1', '2', '3'},
		{'4', '5', '6'},
		{'7', '8', '9'}
	};

	char player = ' ';
	char again;

	introAndRules();

	drawBoard(board);

	// Game Loop:

	do
	{
		game(player, board); 
		cout << "Would you like to play again? (y/n): ";
		cin >> again;
		cout << "\n";
	} while (again == 'y');

	cout << "Game Over!\n";

	return 0;
}

inline void introAndRules()
{
	cout << "\t\tTIC-TAC-TOE\n\n";
	cout << "How to play TIC-TAC-TOE:\n\n";
	cout << "There will be 2 players: \nThe 1st player will play with the letter 'X'.\nThe 2nd player will play with the letter 'O'.\n\n";
	cout << "Your Goal:\nGet 3 of your letters in a row (up, down, across, or diagonally) to win!\nMake sure to block your opponent's letters to stop them from wining!\n\n";
	cout << "Instructions:\nInput where you'd like to place your character from numbers 1-9.\n\n";
}

void drawBoard(const vector<vector<char>>& board)
{
	for (int i = 0; i < 3; ++i)
	{
		cout << "\t\t";

		for (int j = 0; j < 3; ++j)
		{
			if (j != 2) cout << " " << board[i][j] << " |";
			else cout << " " << board[i][j] << " ";
		}

		if (i != 2) cout << "\n\t\t--- --- ---\n";
		else cout << "\n\n";
	}
}

void game(char player, vector<vector<char>> board)
{   
	int moves = 0;
	while (true)
	{
		player = 'X';
		cout << "Player: " << player << ", it's your turn.\n";
		playerTurn(player, board);
		++moves;

		if (moves == 9)
		{
			cout << "Tied!\n\n";
			break;
		}

		drawBoard(board);

		if (gameStatus(player, board) == player)
		{
			cout << "Player 'X' won!\n\n";
			break;
		}

		player = 'O';
		cout << "Player: " << player << ", it's your turn.\n";
		playerTurn(player, board);
		++moves;

		if (moves == 9)
		{
			cout << "Tied!\n\n";
			break;
		}

		drawBoard(board);

		if (gameStatus(player, board) == player)
		{
			cout << "Player 'O' won!\n\n";
			break;
		}
	}
}

void playerTurn(char player, vector<vector<char>>& board)
{
	char move;

	while (true)
	{
		move = getMove();
		if (validMove(move, board)) break;
	}

	updateBoard(player, move, board);
}

char getMove()
{
	char move;
	do
	{
		cout << "Please enter your move (1-9): ";
		cin >> move;

	} while (!isdigit(move) || move == '0');

	cout << "\n";

	return move;
}

bool validMove(char move, const vector<vector<char>>& board)
{
	for (vector<vector<char>>::const_iterator i = board.begin(); i != board.end(); ++i)
	{
		for (vector<char>::const_iterator j = i->begin(); j != i->end(); ++j)
			if (*j == move) return true;
	}

	return false;
}

void updateBoard(char player, char move, vector<vector<char>>& board)
{
	for (vector<vector<char>>::iterator i = board.begin(); i != board.end(); ++i)
	{
		for (vector<char>::iterator j = i->begin(); j != i->end(); ++j)
		{
			if (*j == move) *j = player;
		}
	}
}

char gameStatus(char player, const vector<vector<char>>& board)
{
	// Verticals
	for (int i = 0; i < 3; ++i)
	{
		if (board[0][i] == player && board[1][i] == player && board[2][i] == player)
			return player;
	}

	// Horizontals
	for (int i = 0; i < 3; ++i)
	{
		if (board[i][0] == player && board[i][1] == player && board[i][2] == player)
			return player;
	}

	// Diagonals
	if (board[0][0] == player && board[1][1] == player && board[2][2] == player)
		return player;
	if (board[0][2] == player && board[1][1] == player && board[2][0] == player)
		return player;

	return ' ';
}