Stayed up all night making this beatable AI tic tac toe game.
Spoiler
#include <iostream>
#include <stdlib.h>
#include <cstdlib>
#include <ctime>
using namespace std;
void MakeMove(char[]);
void PrintBoard(char[]);
void GameOver(char[]);
void algorithm(char[]);
int main()
{
srand(time(0));
int choice;
char mark;
char board[10] = {'o', '1', '2', '3', '4', '5', '6', '7', '8', '9'};
MakeMove(board);
}
void MakeMove(char board[])
{
char choice;
PrintBoard(board);
cout << "\n Choose Square #: ";
cin >> choice;
cout << endl << endl;
if (choice == '1' && board[1] == '1')
{
board[1] = 'X';
if (board[5] == '5')
board[5] = 'O';
else algorithm(board);
PrintBoard(board);
GameOver(board);
MakeMove(board);
}
else if (choice == '2' && board[2] == '2')
{
board[2] = 'X';
if (board[5] == '5')
board[5] = 'O';
else algorithm(board);
PrintBoard(board);
GameOver(board);
MakeMove(board);
}
else if (choice == '3' && board[3] == '3')
{
board[3] = 'X';
if (board[5] == '5')
board[5] = 'O';
else algorithm(board);
PrintBoard(board);
GameOver(board);
MakeMove(board);
}
else if (choice == '4' && board[4] == '4')
{
board[4] = 'X';
if (board[5] == '5')
board[5] = 'O';
else algorithm(board);
PrintBoard(board);
GameOver(board);
MakeMove(board);
}
else if (choice == '5' && board[5] == '5')
{
board[5] = 'X';
static int table[] = {1, 3, 7, 9};
int i = rand() % (sizeof table / sizeof *table);
board[i] = 'O';
PrintBoard(board);
GameOver(board);
MakeMove(board);
}
else if (choice == '6' && board[6] == '6')
{
board[6] = 'X';
if (board[5] == '5')
board[5] = 'O';
else algorithm(board);
PrintBoard(board);
GameOver(board);
MakeMove(board);
}
else if (choice == '7' && board[7] == '7')
{
board[7] = 'X';
if (board[5] == '5')
board[5] = 'O';
else algorithm(board);
PrintBoard(board);
GameOver(board);
MakeMove(board);
}
else if (choice == '8' && board[8] == '8')
{
board[8] = 'X';
if (board[5] == '5')
board[5] = 'O';
else algorithm(board);
PrintBoard(board);
GameOver(board);
MakeMove(board);
}
else if (choice == '9' && board[9] == '9')
{
board[9] = 'X';
if (board[5] == '5')
board[5] = 'O';
else algorithm(board);
PrintBoard(board);
GameOver(board);
MakeMove(board);
}
else
MakeMove(board);
}
void PrintBoard(char b[])
{
system("cls");
cout << "\n\n\t Tic Tac Toe\n\n";
cout << " Player 1 (X) - Player 2 (O)" << endl << endl;
cout << "\t | | " <<endl;
cout << "\t " << b[1] << " | " << b[2] << " | " << b[3] << " " <<endl;
cout << "\t—--|—--|—--" <<endl;
cout << "\t " << b[4] << " | " << b[5] << " | " << b[6] << " " <<endl;
cout << "\t—--|—--|—--" <<endl;
cout << "\t " << b[7] << " | " << b[8] << " | " << b[9] << " " <<endl;
cout << "\t | | " <<endl << endl;
}
void GameOver(char board[])
{
if (board[1] != '1' && board[2] != '2' && board[3] != '3' &&
board[4] != '4' && board[5] != '5' && board[6] != '6' &&
board[7] != '7' && board[8] != '8' && board[9] != '9')
{
cout << "Cat's game!" << endl << endl;
exit(0);
}
else if (board[1] == 'X' && board[2] == 'X' && board[3] == 'X')
{cout << "You win!" << endl << endl;
exit(0);}
else if (board[1] == 'X' && board[4] == 'X' && board[7] == 'X')
{cout << "You win!" << endl << endl;
exit(0);}
else if (board[2] == 'X' && board[5] == 'X' && board[8] == 'X')
{cout << "You win!" << endl << endl;
exit(0);}
else if (board[4] == 'X' && board[5] == 'X' && board[6] == 'X')
{cout << "You win!" << endl << endl;
exit(0);}
else if (board[3] == 'X' && board[6] == 'X' && board[9] == 'X')
{cout << "You win!" << endl << endl;
exit(0);}
else if (board[7] == 'X' && board[8] == 'X' && board[9] == 'X')
{cout << "You win!" << endl << endl;
exit(0);}
else if (board[1] == 'X' && board[5] == 'X' && board[9] == 'X')
{cout << "You win!" << endl << endl;
exit(0);}
else if (board[3] == 'X' && board[5] == 'X' && board[7] == 'X')
{cout << "You win!" << endl << endl;
exit(0);}
else if (board[1] == 'O' && board[2] == 'O' && board[3] == 'O')
{cout << "You lose!" << endl << endl;
exit(0);}
else if (board[1] == 'O' && board[4] == 'O' && board[7] == 'O')
{cout << "You lose!" << endl << endl;
exit(0);}
else if (board[2] == 'O' && board[5] == 'O' && board[8] == 'O')
{cout << "You lose!" << endl << endl;
exit(0);}
else if (board[4] == 'O' && board[5] == 'O' && board[6] == 'O')
{cout << "You lose!" << endl << endl;
exit(0);}
else if (board[3] == 'O' && board[6] == 'O' && board[9] == 'O')
{cout << "You lose!" << endl << endl;
exit(0);}
else if (board[7] == 'O' && board[8] == 'O' && board[9] == 'O')
{cout << "You lose!" << endl << endl;
exit(0);}
else if (board[1] == 'O' && board[5] == 'O' && board[9] == 'O')
{cout << "You lose!" << endl << endl;
exit(0);}
else if (board[3] == 'O' && board[5] == 'O' && board[7] == 'O')
{cout << "You lose!" << endl << endl;
exit(0);}
}
void algorithm(char board[])
{
//offensive moves
if (board[1] == 'O' && board[2] == 'O' && board[3] == '3')
board[3] = 'O';
else if (board[1] == 'O' && board[4] == 'O' && board[7] == '7')
board[7] = 'O';
else if (board[1] == 'O' && board[5] == 'O' && board[9] == '9')
board[9] = 'O';
else if (board[1] == 'O' && board[3] == 'O' && board[2] == '2')
board[2] = 'O';
else if (board[1] == 'O' && board[7] == 'O' && board[4] == '4')
board[4] = 'O';
else if (board[1] == 'O' && board[9] == 'O' && board[5] == '5')
board[5] = 'O';
else if (board[2] == 'O' && board[3] == 'O' && board[1] == '1')
board[1] = 'O';
else if (board[2] == 'O' && board[5] == 'O' && board[8] == '8')
board[8] = 'O';
else if (board[2] == 'O' && board[8] == 'O' && board[5] == '5')
board[5] = 'O';
else if (board[3] == 'O' && board[6] == 'O' && board[9] == '9')
board[9] = 'O';
else if (board[3] == 'O' && board[9] == 'O' && board[1] == '6')
board[6] = 'O';
else if (board[3] == 'O' && board[5] == 'O' && board[7] == '7')
board[7] = 'O';
//defensive moves
else if (board[1] == 'X' && board[2] == 'X' && board[3] == '3')
board[3] = 'O';
else if (board[1] == 'X' && board[4] == 'X' && board[7] == '7')
board[7] = 'O';
else if (board[1] == 'X' && board[5] == 'X' && board[9] == '9')
board[9] = 'O';
else if (board[1] == 'X' && board[3] == 'X' && board[2] == '2')
board[2] = 'O';
else if (board[1] == 'X' && board[7] == 'X' && board[4] == '4')
board[4] = 'O';
else if (board[1] == 'X' && board[9] == 'X' && board[5] == '5')
board[5] = 'O';
else if (board[2] == 'X' && board[3] == 'X' && board[1] == '1')
board[1] = 'O';
else if (board[2] == 'X' && board[5] == 'X' && board[8] == '8')
board[8] = 'O';
else if (board[2] == 'X' && board[8] == 'X' && board[5] == '5')
board[5] = 'O';
else if (board[3] == 'X' && board[6] == 'X' && board[9] == '9')
board[9] = 'O';
else if (board[3] == 'X' && board[9] == 'X' && board[1] == '6')
board[6] = 'O';
else if (board[3] == 'X' && board[5] == 'X' && board[7] == '7')
board[7] = 'O';
//misc moves
else if (board[1] == '1')
board[1] = 'O';
else if (board[2] == '2')
board[2] = 'O';
else if (board[3] == '3')
board[3] = 'O';
else if (board[4] == '4')
board[4] = 'O';
else if (board[5] == '5')
board[5] = 'O';
else if (board[6] == '6')
board[6] = 'O';
else if (board[7] == '7')
board[7] = 'O';
else if (board[8] == '8')
board[8] = 'O';
else if (board[9] == '9')
board[9] = 'O';
}
Feel free to let me know how shitty it is.
Hello fellow robots