cout << "CPU takes its turn...n";

if (box[2] == box[3] || box[4] == box[7] ||
    box[5] == box[9] && box[1] != 'X' || box[1] != 'O') return 1;

if (box[1] == box[3] || box[5] == box[8] && box[2] != 'X' || box[2] != 'O') return 2;

if (box[1] == box[2] || box[6] == box[9] && box[3] != 'X' || box[3] != 'O') return 3;

if (box[1] == box[7] || box[5] == box[6] && box[4] != 'X' || box[4] != 'O') return 4;

if (box[1] == box[9] || box[4] == box[6] ||
    box[2] == box[8] || box[3] == box[7] && box[5] != 'X' || box[5] != 'O') return 5;

if (box[3] == box[9] || box[4] == box[5] && box[6] != 'X' || box[6] != 'O') return 6;

if (box[1] == box[4] || box[8] == box[9] ||
    box[3] == box[5] && box[7] != 'X' || box[7] != 'O') return 7;

if (box[7] == box[9] || box[2] == box[5] && box[8] != 'X' || box[8] != 'O') return 8;

if (box[1] == box[5] || box[7] == box[8] ||
    box[3] == box[6] && box[9] != 'X' || box[9] != 'O') return 9;

else {

}
}

#include <iostream>
#include <cstdlib>
using namespace std;

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

int checkwin();
void board();
int CPUmove();


int main()
{
bool exit = true;
while (exit){
box[0] = 'v';
box[1] = '1';
box[2] = '2';
box[3] = '3';
box[4] = '4';
box[5] = '5';
box[6] = '6';
box[7] = '7';
box[8] = '8';
box[9] = '9';
    int player = 1, i, choice,intexit;
    char mark;
    srand(time(0));

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

            if (player == 1){
            cout << "Enter the number of the box you want to choose:  ";
            cin >> choice;
            }

            else if (player == 2) choice = CPUmove();

            mark = (player == 1) ? 'X' : 'O';

            if (box[choice] == (char)(((int)'0')+choice))
            box[choice] = mark;

            else
                {
                    cout << "Invalid move ";
                    player--;
                    cin.ignore();
                    cin.get();
                }

            i = checkwin();
            player++;

        } while(i == -1);

    board();
    if (i == 1) cout << "==>aPlayer " << --player << " wins!";
    else cout << "==>aTie game, you both stink.";
    cout<<"do you want to play an other game: press 1 else: press 2: ";
    cin>>intexit;
    if (intexit==2)
        exit = false;
    cin.ignore();
    cin.get();
}

return 0;
}