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Tic-Tac-Toe

crimsonzero2 (213)
Hello, I've been working on an AI program that has two AIs going against each other in tic-tac-toe. I've been working on translating it from Java to C++ because I don't work well with Java. I should get output like this:
UPDATE: I found a little typo in the program, but it is still having issues... Here is the updated output now:

   |   |
-----------
   |   |
-----------
   |   |

 X |   |
-----------
   |   |
-----------
   |   |

 X |   |
-----------
   | O |
-----------
   |   |

 X | X |
-----------
   | O |
-----------
   |   |

 X | X | O
-----------
   | O |
-----------
   |   |

 X | X | O
-----------
 X | O |
-----------
   |   |

 X | X | O
-----------
 X | O |
-----------
 O |   |

 X | X | O
-----------
 X | O |
-----------
 O |   | X

 X | X | O
-----------
 X | O | O
-----------
 O |   | X

 X | X | O
-----------
 X | O | O
-----------
 O | X | X


But, I get this:

   |   |
-----------
   |   |
-----------
   |   |

 X |   |
-----------
   |   |
-----------
   |   |

 X | O |
-----------
   |   |
-----------
   |   |

 X | O | X
-----------
   |   |
-----------
   |   |

 X | O | X
-----------
 O |   |
-----------
   |   |

 X | O | X
-----------
 O | X |
-----------
   |   |

 X | O | X
-----------
 O | X | O
-----------
   |   |

 X | O | X
-----------
 O | X | O
-----------
   |   | X


Any ideas on why it would be different? The code will be posted after this post.
Last edited on
crimsonzero2 (213)
AIPlayer.hpp
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#ifndef AIPLAYER_HPP_INCLUDED
#define AIPLAYER_HPP_INCLUDED

#include <string>
#include <vector>
#include <limits>
#include <algorithm>

#include "Game.hpp"

using namespace std;
class AIPlayer
{
    private:
        string name;
        int playerNumber;
        int minValue(Game game);
        int maxValue(Game game);

    public:
        AIPlayer(string name, int playerNumber);
        string getName();
        Game Move(Game game);
};

int AIPlayer::minValue(Game game)
{
    if(game.terminalTest())
        return game.getHeuristic(playerNumber);
    else
    {
        vector<Game> possibleMoves = game.Moves(-playerNumber);
        int v = std::numeric_limits<int>::max();
        for(unsigned int i = 0; i < possibleMoves.size(); i++)
        {
            v = std::min(v, maxValue(possibleMoves[i]));
        }

        return v;
    }
}

int AIPlayer::maxValue(Game game)
{
    if(game.terminalTest())
        return game.getHeuristic(playerNumber);
    else
    {
        vector<Game> possibleMoves = game.Moves(playerNumber);
        int v = std::numeric_limits<int>::min();
        for(unsigned int i = 0; i < possibleMoves.size(); i++)
        {
            v = std::max(v, minValue(possibleMoves[i]));
        }

        return v;
    }
}

AIPlayer::AIPlayer(string name, int playerNumber)
{
    this->name = name;
    this->playerNumber = playerNumber;
}

string AIPlayer::getName()
{
    return name;
}

Game AIPlayer::Move(Game game)
{
    vector<Game> possibleMoves = game.Moves(playerNumber);

    int moveUtility[possibleMoves.size()];
    unsigned int array_size = sizeof(moveUtility)/sizeof(moveUtility[0]);
    for(unsigned int i = 0; i < array_size; i++)
    {
        Game thisMove = possibleMoves[i];
        moveUtility[i] = minValue(thisMove);
    }

    int bestMoveIndex = 0;
    for(unsigned int i = 1; i < array_size; i++)
    {
        if(moveUtility[i] > moveUtility[bestMoveIndex])
        {
            bestMoveIndex = i;
        }
    }

    Game bestMove = possibleMoves[bestMoveIndex];
    return bestMove;
}
#endif // AIPLAYER_HPP_INCLUDED


Game.hpp
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#ifndef GAME_HPP_INCLUDED
#define GAME_HPP_INCLUDED

#include <iostream>
#include <vector>

using namespace std;
class Game
{
    private:
        int board[3][3];
        char boardChar(int n);
        int boardValue();

    public:
        Game();
        Game(const Game& game);
        Game(const Game* otherGame);
        vector<Game> Moves(int toPlay);
        bool terminalTest();
        int getHeuristic(int playerNumber);
        bool checkForDraw();
        void printBoard();
};

char Game::boardChar(int n)
{
    if(n == 1)
    {
        return 'X';
    }
    else if(n == -1)
    {
        return 'O';
    }
    else
    {
        return ' ';
    }
}

int Game::boardValue()
{
    for(int i = 0; i < 3; i++)
    {
        if(board[i][0] == board[i][1] && board[i][1] == board[i][2] && board[i][0] != 0)
            return board[i][0];
    }

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

    if(board[0][0] == board[1][1] && board[1][1] == board[2][2] && board[0][0] != 0)
        return board[0][0];

    if(board[0][2] == board[1][1] && board[1][1] == board[2][2] && board[2][0] != 0)
        return board[0][2];

    return 0;
}

Game::Game()
{
    for(int i = 0; i < 3; i++)
    {
        for(int j = 0; j < 3; j++)
        {
            this->board[i][j] = 0;
        }
    }
}

Game::Game(const Game& game)
{
    for(int i = 0; i < 3; i++)
    {
        for(int j = 0; j < 3; j++)
        {
            board[i][j] = game.board[i][j];
        }
    }
}

Game::Game(const Game* otherGame)
{
    for(int i = 0; i < 3; i++)
    {
        for(int j = 0; j < 3; j++)
        {
            this->board[i][j] = otherGame->board[i][j];
        }
    }
}
vector<Game> Game::Moves(int toPlay)
{
    vector<Game> children;

    for(int i = 0; i < 3; i++)
    {
        for(int j = 0; j < 3; j++)
        {
            if(board[i][j] == 0)
            {
                Game child(this);
                child.board[i][j] = toPlay;
//                cout << "child: " << endl;
//                printBoard();
//                cout << endl;
                children.push_back(child);
            }
        }
    }

    return children;
}

bool Game::terminalTest()
{
    return(boardValue() != 0 || checkForDraw());
}

int Game::getHeuristic(int playerNumber)
{
    return playerNumber * boardValue();
}

bool Game::checkForDraw()
{
    bool allFilledIn = true;
    for(int i = 0; i < 9; i++)
    {
        int row = i/3;
        int col = i - (3 * row);
        if(board[row][col] == 0)
        {
            allFilledIn = false;
            break;
        }
    }

    bool isDraw = (allFilledIn && boardValue() == 0);
    return isDraw;
}

void Game::printBoard()
{
    string topRow;
    topRow = std::string(" ") + boardChar(board[0][0]) + " | "
             + boardChar(board[0][1]) + " | " + boardChar(board[0][2]) + " ";
    string line = "-----------";
    string midRow = std::string(" ") + boardChar(board[1][0]) + " | "
                    + boardChar(board[1][1]) + " | " + boardChar(board[1][2]) + " ";
    string botRow = std::string(" ") + boardChar(board[2][0]) + " | "
                    + boardChar(board[2][1]) + " | " + boardChar(board[2][2]) + " ";

    cout << topRow << endl;
    cout << line << endl;
    cout << midRow << endl;
    cout << line << endl;
    cout << botRow << endl;
}
#endif // GAME_HPP_INCLUDED


PlayGame.cpp
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#include <iostream>
#include <string>

#include "Game.hpp"
#include "AIPlayer.hpp"
using namespace std;

int main()
{
    AIPlayer Cross("Cross", 1);
    AIPlayer Naught("Naught", -1);

    Game game;

    int toPlay = 1;
    game.printBoard();
    cout << endl;
    bool gameOver = false;

    while(!gameOver)
    {
        if(toPlay == 1)
            game = Cross.Move(game);
        else
            game = Naught.Move(game);

        game.printBoard();
        cout << endl;
        gameOver = game.terminalTest();
        toPlay = -toPlay;
    }
}


I'll give the java code if it is necessary for anything.
Last edited on
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