#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
********************************************************************/