#include <iostream>
using namespace std;

int Board[9] = {0,0,0,0,0,0,0,0,0};
int P1, P2;

bool Taken (int Board[],int x) {
    if(Board[x]!=0)
        return true;
    else
        return false;
}

bool Done(int * Board) {
    for(int i = 0; i < 9; i++)
        if(Board[i]!=0)
            return false;
    return true;

}

int main() {
    while (!Done(Board)){
        cout << "Player 1's turn." << endl;
        cin >> P1;
        if(Taken(Board, P1)) {
                cout << "That is taken, please select another" << endl;
                cin >> P1;
        }
        else {
            Board[P1] = 1;
            cout << "You have selected spot " << P1 << endl;
        }
        cout << "Player 2's turn." << endl;
        cin >> P2;
        if(Taken(Board, P2)) {
                cout << "That is taken, please select another" << endl;
                cin >> P2;
        }
        else {
            Board[P2] = -1;
            cout << "You have selected spot " << P2 << endl;
        }
    }
    return 0;
}