C++ program for Tic Tac Toe game
using namespace std;
char symbol[10];
//initialising starting elements of board
void starting_board()
{
int i;
for( i=1 ; i<=9 ; i++)
{
symbol[i]=i+48;
}
}
// Function to create board
void create_board()
{
cout << "Player 1 (X) - Player 2 (O)" << "\n\n\n";
cout << " | | \n";
cout << " " << symbol[1] << " | " << symbol[2] << " | " << symbol[3] << "\n";
cout << "_____|_____|_____\n";
cout << " | | \n";
cout << " " << symbol[4] << " | " << symbol[5] << " | " << symbol[6] << "\n";
cout << "_____|_____|_____\n";
cout << " | | \n";
cout << " " << symbol[7] << " | " << symbol[8] << " | " << symbol[9] << "\n";
cout << " | | \n\n";
}
// function to check winner
string check_winner( )
{
if (symbol[1] == symbol[2] && symbol[2] == symbol[3])
return "Winner";
else if (symbol[4] == symbol[5] && symbol[5] == symbol[6])
return "Winner";
else if (symbol[7] == symbol[8] && symbol[8] == symbol[9])
return "Winner";
else if (symbol[1] == symbol[4] && symbol[4] == symbol[7])
return "Winner";
else if (symbol[2] == symbol[5] && symbol[5] == symbol[8])
return "Winner";
else if (symbol[3] == symbol[6] && symbol[6] == symbol[9])
return "Winner";
else if (symbol[1] == symbol[5] && symbol[5] == symbol[9])
return "Winner";
else if (symbol[3] == symbol[5] && symbol[5] == symbol[7])
return "Winner";
else if (symbol[1] != '1' && symbol[2] != '2' && symbol[3] != '3'
&& symbol[4] != '4' && symbol[5] != '5' && symbol[6] != '6'
&& symbol[7] != '7' && symbol[8] != '8' && symbol[9] != '9')
return "game_over";
else
return "play_again";
}
int main()
{
int player=1 , i , choice ;
char sym ;
string game="play_again";
starting_board();
//main logic starts here
while( game == "play_again")
{
create_board();
int turn = player % 2;
if(turn==1)
{
sym='X';
}
else
{
sym ='O';
turn = 2;
}
cout<<"Player = "<<turn<<" Enter a number "<<"\n\n";
cin>>choice;
for( i=1 ; i<=9 ; i++)
{
if(choice==i && symbol[i]==i+48)
{
symbol[i]=sym;
break;
}
}
if(i > 9) //
{
cout<<"Enter valid number\n";
cin>>choice;
for( i=1 ; i<=9 ; i++)
{
if(choice==i && symbol[i]==i+48)
{
symbol[i]=sym;
break;
}
}
if(i > 9) //for invalid number
{
cout<<"Enter valid number\n";
cin>>choice;
}
else{
create_board();
game = check_winner();
if(game=="game_over")
cout<<"Game over and no one has won!!\n\n";
else if(game == "play_again")
player++;
else
cout<<turn<<" has won the game\n\n";
}
}
else{
create_board();
game = check_winner();
if(game=="game_over")
cout<<"Game over and no one has won!!\n\n";
else if(game == "play_again")
player++;
else
cout<<turn<<" has won the game\n\n";
}
}
}
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