This one is on how to write a tic tac toe c++ game that plays against the computer. When the blackjack assignment was shared on StumbleUpon, it generated a large amount of traffic towards the C++ Better Explained site with over 2500 new visitors to the site. Due to popular demand, here is another article on game development with C++.
Tic Tac Toe Code using Classes
Just like the previous example of implementing blackjack in C++, there are several elements of the Tic Tac toe game that we need to break down. The following code example shows just how that is being done by creating a class of the game and creating a separate function for the needed piece of the game that is required.
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//Tic Tac Toe Class
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#ifndef TIC_TAC_TOE
#define TIC_TAC_TOE
#include <time.h>
#include <stdlib.h>
#include <stdio.h>
#include <iostream>
using std::cout;
class TicTacToe
{
private:
int pos[9]; // board position
int player; // current player
int totalTurns; // how many turns so far?
int numberPlayers; // 1 to 20
bool playerType[20]; // player #, 0 = comp, 1 = human
public:
TicTacToe();
void printTurn();
bool playerHuman();
void humanMove();
void computerMove();
void drawBoard();
bool Winner();
bool fullBoard();
void nextTurn();
};
#endif
Tic_Tac_Toe.cpp file – drawBoard() and other main functions
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// Tic Tac Toe constructor
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TicTacToe::TicTacToe()
{
srand (time(0));
player = 1; // who starts first?
totalTurns = 0;
// new player setup
numberPlayers = 2;
playerType[1] = 1; // playerType[player] is human (1)
playerType[2] = 0; // playerType[player] is computer (0)
for (int i = 0; i < 9; i++)
{
pos[i] = 0;
}
}
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// Draw the Tic Tac Toe Board and seperate the board
// with the help of |
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void TicTacToe::drawBoard()
{
std::cout << std::endl<< pos[0] << " | " << pos[1] << " | " << pos[2]<< "\n?\n"<< pos[3] << " | " << pos[4] << " | " << pos[5]<< "\n?\n"<< pos[6] << " | " << pos[7] << " | " << pos[8]<< std::endl;}
void TicTacToe::printTurn()
{
std::cout << "\nPlayer " << player << "'s turn.\n";
}
void TicTacToe::nextTurn()
{
totalTurns++;
if (++player > numberPlayers)
player = 1;
}
bool TicTacToe::playerHuman()
{
return playerType[player];
}
void TicTacToe::humanMove()
{
std::cout << "\nEnter your move: ";
int move;
do
{
std::cin >> move;
move−−; // so user can enter 1−9 instead of 0−8
}
while (move < 0 || move > 8 || pos[move] != 0);
pos[move] = player;
}
void TicTacToe::computerMove()
{
int move;
do
{
// Pick a random number from 1 − 9
move = rand() % 9; // just pick a random number
}
while (move < 0 || move > 8 || pos[move] != 0);
pos[move] = player;
}
bool TicTacToe::Winner()
{
int board[8][3] = {{0,1,2},
// winning possibilities
{3,4,5},
{6,7,8},
{0,3,6},
{1,4,7},
{2,5,8},
{0,4,8},
{2,4,6}};
// Go through the list of possibilities
for (int i = 0; i < 8; i++)
{
if ((pos[board[i][0]] == pos[board[i][1]]) && (pos[board[i][1]] == pos[board[i][2]]) && pos[board[i][0]] != 0)
{
cout << "\nPlayer " << pos[board[i][0]] << " wins!\n\n";
return 1; // return winner true
}
}
return 0; // winner false
}
bool TicTacToe::fullBoard()
{
if (totalTurns == 9)
{
cout << "\nTie game!\n\n";
return 1;
}
else
return 0;
}
Main.cpp file
#include "Tic_Tac_Toe.h"
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// Main function of the game
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int main()
{
TicTacToe Game;
Game.drawBoard();
do
{
Game.printTurn();
if (Game.playerHuman()) // human turn?
Game.humanMove();
else
Game.computerMove();
Game.drawBoard();
Game.nextTurn();
}
// Keep running the game until there is a winner and the game board is full
while (!Game.Winner() && !Game.fullBoard());
return 0;
}
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