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

#include <iostream>
using namespace std;

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

int checkwin();
void board();

int main()
{
        int player = 1,i,choice;

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

                cout << "Player " << player << ", enter a number:  ";
                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
                {
                        cout<<"Invalid move ";

                        player--;
                        cin.ignore();
                        cin.get();
                }
                i=checkwin();

                player++;
        }while(i==-1);
        board();
        if(i==1)

                cout<<"==>\aPlayer "<<--player<<" win ";
        else
                cout<<"==>\aGame draw";

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

/*********************************************

        FUNCTION TO RETURN GAME STATUS
        1 FOR GAME IS OVER WITH RESULT
        -1 FOR GAME IS IN PROGRESS
        O GAME IS OVER AND NO RESULT
**********************************************/

int checkwin()
{
        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;
}


/*******************************************************************
     FUNCTION TO DRAW BOARD OF TIC TAC TOE WITH PLAYERS MARK
********************************************************************/


void board()
{
        system("cls");
        cout << "\n\n\tTic Tac Toe\n\n";

        cout << "Player 1 (X)  -  Player 2 (O)" << endl << endl;
        cout << endl;

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

        cout << "_____|_____|_____" << endl;
        cout << "     |     |     " << endl;

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

        cout << "_____|_____|_____" << endl;
        cout << "     |     |     " << endl;

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

        cout << "     |     |     " << endl << endl;
}

/*******************************************************************
                                END OF PROJECT
********************************************************************/