Simple-TicTacToe

#include <iostream>
#include <cstdlib>
using namespace std;
int poss_win(int *board,char choice)
{
    int val, check;
    if(choice == 'X')
        val = 18;
    else
        val = 50;
    int vertical[] = {0, 1, 4, 7};
    int horizontal[]= {0, 1, 2, 3};
    for(int i = 1; i <= 3; i++)
    {
        int ver = vertical[i];
        //cout << "Prod" << board[ver] <<  board[ver + 1] << board[ver + 2] << endl;
        if(board[ver] * board[ver + 1] * board[ver + 2] == val)
        {
            if(board[ver] == 2)
                return ver;
            else if(board[ver + 1] == 2)
                return ver + 1;
            else
                return ver + 2;
        }
        int hor = horizontal[i];
        if(board[hor] * board[hor + 3] * board[hor + 6] == val)
        {
            if(board[hor] == 2)
                return hor;
            else if(board[hor + 3] == 2)
                return hor + 3;
            else
                return hor + 6;
        }
    }
    if(board[1] * board[5] * board[9] == val)
    {
        if(board[1] == 2)
            return 1;
        else if(board[5] == 2)
            return 5;
        else
            return 9;
    }
    if(board[3] * board[5] * board[7] == val)
    {
        if(board[3] == 2)
            return 3;
        else if(board[5] == 2)
            return 5;
        else
            return 7;
    }
    return 0;
}
void print(int *board)
{
    char arr[10];
    arr[2] = ' ';
    arr[3] = 'X';
    arr[5] = 'O';
    cout << endl;
    for(int i = 1; i <= 9; i++)
    {
        //cout << board[i] ;
        cout << " "<<  arr[board[i]] << "  | "<< " ";
        if(i % 3 == 0)
            cout << endl << "------------------" << endl;
    }
    cout << endl;
}
void go(int *board, int pos, int val)
{
    board[pos] = val;
}
void comp(int *board, char choice)
{
    int val;
    if(choice == 'X')
        val = 3;
    else
        val = 5;
    if(board[5] == 2)
    {
        //cout << "D1" << endl;
        go(board, 5, val);
        return;
    }
    else
    {
        int x_win = poss_win(board, 'X');
        int o_win = poss_win(board, 'O');
        //cout << "POSS" << x_win << " " << o_win << endl;
        if(val == 3 && x_win)
        {
            //cout << "3, x_win" << endl;
            go(board, x_win, val);
            print(board);
            cout << "Computer Won" << endl;
            exit(0);

        }
        else if(val == 3 && o_win)
        {
            //cout << "3, o_win" << endl;
            go(board, o_win, val);
        }
        else if(val == 5 && o_win)
        {
            //cout << "5, o_win" << endl;
            go(board, o_win, val);
            print(board);
            cout << "Computer Won" << endl;
            exit(0);
        }
        else if(val == 5 && x_win)
        {
            //cout << "5, x_win" << endl;
            go(board, x_win, val);
        }
        else
        {
            //cout << "D4" << endl;
            int pref[] = {1, 3, 7, 9, 2, 4, 6, 8}, count = 0;
            while(board[pref[count]] != 2 )
                count++;
            go(board, pref[count], val);
        }
    }
}
int* human(int *board, char choice)
{
    int val = 2;
    if(choice == 'X')
        val = 3;
    else
        val = 5;
    int in = 0;
    while(in < 1 or in > 10 or (board[in] != 2))
    {
        cout << "Give position : ";
        cin >> in;
        cout << endl;
    }

    go(board, in, val);
    return board;
}
void play(int *board, char choice)
{
    char human_choice, comp_choice;
    human_choice = choice;
    if(choice == 'X')
    {
        cout << "Human Player " << endl;
        human(board, human_choice);
        print(board);
        comp_choice = 'O';
    }
    else
        comp_choice = 'X';
    for(int i = 1; i <= 4; i++)
    {
        cout << "Computer Player " << endl;
        comp(board, comp_choice);
        print(board);
        cout << "Human Player " << endl;
        human(board, human_choice);
        print(board);
    }
    if(choice == 'O')
    {
        cout << "Computer Player " << endl;
        comp(board, comp_choice);
        print(board);
    }

}
int main(int argc, char *argv[])
{
    char choice;
    cout << "Select X or O : ";
    cin >> choice;
    cout << endl;
    if(choice == 'X' or choice == 'O')
    {
        int board[9];
        // 2 blank
        // 3 X
        // 5 O
        for(int i = 1; i <= 9; i++)
            board[i]= 2;
        play(board, choice);
    }
    else
    {
        cout << "Wrong choice." << endl;
    }
    return 0;
}