TicTacToe.cpp

#include <iostream>

char square[10] = {'0','1','2','3','4','5','6','7','8','9'};

//Function to return the game status

/*
  Description :
    Checks to see if there is a straight X or O of 3

  Arguments :
    No arguements in this function
 
  Returns :
    No returns in this function
*/
int winningcheck() {
    if (square[1] == square[2] && square[2] == square[3]) {
        return 1;
    }

    else if (square[4] == square[5] && square[5] == square[6]) {
        return 1;
    }

    else if (square[7] == square[8] && square[8] == square[9]) {
        return 1;
    }

    else if (square[1] == square[4] && square[4] == square[7]) {
        return 1;
    }

    else if (square[2] == square[5] && square[5] == square[8]) {
        return 1;
    }

    else if (square[3] == square[6] && square[6] == square[9]) {
        return 1;
    }

    else if (square[1] == square[5] && square[5] == square[9]) {
        return 1;
    }

    else if (square[3] == square[5] && square[5] == square[7]) {
    return 1;
    }

    else if (square[1] != '1' && square[2] != '2' && square[3] != '3' 
            && square[4] != '4' && square[5] != '5' && square[6] != '6' 
            && square[7] != '7' && square[8] != '8' && square[9] != '9') {
                return 0;
            }
    
    else {
        return -1;
    }
}
/*
  Description :
    Creates the board by std::cout the design of the square game \

  Arguments :
    No arguements in this function
 
  Returns :
    No returns in this function
*/
void board() {
    system("cls");
    std::cout << "\n\nLet's play a Tic Tac Toe Game! \n\n";
    std::cout << "Player 1(X) - Player 2(O)" << std::endl << std::endl;
    std::cout << std::endl;

    std::cout << "     |     |     " << std::endl;
    std::cout << " " << square[7] << "   |  " << square[8] << "  |   " << square[9] << std::endl;

    std::cout << "_ _ _|_ _ _|_ _ _" << std::endl;
    std::cout << "     |     |     " << std::endl;

    std::cout << " " << square[4] << "   |  " << square[5] << "  |   " << square[6] << std::endl;

    std::cout << "_ _ _|_ _ _|_ _ _" << std::endl;
    std::cout << "     |     |      " << std::endl;

    std::cout << " " << square[1] << "   |  " << square[2] << "  |   " << square[3] << std::endl;

    std::cout << "     |     |    " << std::endl << std::endl;
}

/*
  Description :
    Takes in the board function and marks squares that are chosen by the player

  Arguments :
    No arguements in this function
 
  Returns :
    No returns in this function
*/
int PlayGame() {
    int player = 1, i, choice;

    char mark;

    do {
        board();
        player =(player%2)?1:2;

        std::cout << "Player " << player << ", Enter the Number: ";
        std::cin >> choice;

        mark = (player == 1) ? 'X' : 'O';

        if (choice == 1 && square[1] == '1') {
            square[1] = mark;
        }

        else if (choice == 2 && square[2] == '2') {
            square[2] = mark;
        }

        else if (choice == 3 && square[3] == '3') {
            square[3] = mark;
        }

        else if (choice == 4 && square[4] == '4') {
            square[4] = mark;
        }

        else if (choice == 5 && square[5] == '5') {
            square[5] = mark;
        }

        else if (choice == 6 && square[6] == '6') {
            square[6] = mark;
        }

        else if (choice == 7 && square[7] == '7') {
            square[7] = mark;
        }

        else if (choice == 8 && square[8] == '8') {
            square[8] = mark;
        }

        else if (choice == 9 && square[9] == '9') {
            square[9] = mark;
        }

        else {
            std::cout << "INVALID MOVE!";

            player--;
            std::cin.ignore();
            std::cin.get();
        }

        i = winningcheck();
        player++;
    }
    
    while(i == -1); {
        board();
        if (i == 1) {
            std::cout << "\aCONGRATULATIONS! PLAYER " << --player << " WINS!" << std::endl;
        }

        else {
            std::cout << "\aIT'S A DRAW!";
        }

        std::cin.ignore();
        std::cin.get();
        return 0;
    }
}

int main(void) {
    bool playAgain = true;
    while (playAgain) {
        PlayGame();
        std::cout << "\nWant to play again (y / n)? ";
        char answer;
        std::cin >> answer;
        if ((answer) != 'y') {
            playAgain = false;
            std::cout << "\nThank you for playing my game!" << std::endl;
        }

        //Resets the board to be played again
        else {
            for (int i = 1; i < 10; i++) {
            square[i] = '0' + i;
            }
        }
    }

    return 0;
}