TIC-TAC-TOE

// A basic yet interesting game 

#include <iostream.h>
#include <string.h>
#include <conio.h>

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;
clrscr();
do
{
board();
player=(player%2)?1:2;                                                // to assign the player
cout << "Player " << player << ", enter a number:  ";
cin >> choice;
mark=(player == 1) ? 'X' : 'O';                                     // to assign 'X' to player 1 and 'O' to player 2
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--;
getch();
}
i=checkwin();                         // to check if the any player won the game or not.
player++;
}while(i==-1);
board();                                // to show the actual grid of TIC TAC TOE
if(i==1)
cout<<"==>\aPlayer "<<--player<<" win ";                
else
cout<<"==>\aGame draw";
getch();
return 0;
}

int checkwin()
{
if (square[1] == square[2] && square[2] == square[3])           // for horizontal check of similar symbol
return 1;
else if (square[4] == square[5] && square[5] == square[6])    // for horizontal check of similar symbol
return 1;
else if (square[7] == square[8] && square[8] == square[9])    // for horizontal check of similar symbol
return 1;
else if (square[1] == square[4] && square[4] == square[7])   // for vertical check of similar symbol
return 1;
else if (square[2] == square[5] && square[5] == square[8])  // for vertical check of similar symbol
return 1;
else if (square[3] == square[6] && square[6] == square[9])  // for vertical check of similar symbol
return 1;
else if (square[1] == square[5] && square[5] == square[9]) // for diagonal check of similar symbol
return 1;
else if (square[3] == square[5] && square[5] == square[7]) // // for diagonal check of similar symbol
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;
}



void board()
{
clrscr();
cout << "\n\n\tTic Tac Toe\n\n";
cout << "Player 1 (X)  -  Player 2 (O)" << endl << endl;
cout << endl;
cout << "\t\t"<< "     |     |     " << endl;
cout << "\t\t"<< "  " << square[1] << "  |  " << square[2] << "  |  " << square[3] << endl;
cout << "\t\t"<<"_____|_____|_____" << endl;
cout << "\t\t"<<"     |     |     " << endl;
cout << "\t\t"<<"  " << square[4] << "  |  " << square[5] << "  |  " << square[6] << endl;
cout << "\t\t"<<"_____|_____|_____" << endl;
cout << "\t\t"<<"     |     |     " << endl;
cout << "\t\t"<<"  " << square[7] << "  |  " << square[8] << "  |  " << square[9] << endl;
cout << "\t\t"<<"     |     |     " << endl << endl;
}

// there is a problem in uploading screenshots of the program, as blogger is displaying it as blurred ones' .