Tic-tac-toe AI problems

[every1play]

Can any1 give anysuggestion on how to complete my ai?
here's my code

#include <iostream>

using namespace std;

char board[9] = { '1', '2', '3', '4', '5', '6', '7', '8', '9'};
void display();
bool WinningCondition();
void GetPlayerMove(bool);
void GetAIMove(bool);
bool CorrectDrop(int);
int choice;

void main()
        {
        bool player = false;            
        int i= 0;

        display();

        while(!WinningCondition())
                if ( i==0 || i==2  || i==4 || i==6 || i==8 )
                {
                        i++;
                        {
                        if(player == true)
                                player = false;
                        else
                                player = true;
                                GetPlayerMove(player);
                        }
                }
                else if ( i==1 || i == 3  || i==5 || i==7 )
                {
                        i++;
                        {
                        if(player == true)
                                player = false;
                        else
                                player = true;
                                GetAIMove(player);
                        }
                }
                else
                cout << " It's a TIE !!! " << endl;


        
        if(player == true)
                cout << "Player one WINS !!!" << endl;
        else
                cout << "The computer WINS !!!" << endl;
        }
        

void display()
        {
			system("cls");
	cout << "\n " << board[0] << " | " << board[1] << " | " << board[2] << endl
		 << " ---------" << endl
		 << " " << board[3] << " | " << board[4] << " | " << board[5] << endl
		 << " ---------" << endl
		 << " " << board[6] << " | " << board[7] << " | " << board[8] << endl;
        }

bool WinningCondition()
        {
          if(board[0] == board[1] && board[2] == board[0])//1st horizontal 
		return true;
	else if(board[3] == board[4] && board[5] == board[3])//2nd horizontal 
		return true;
	else if(board[6] == board[7] && board[8] == board[6])//3rd horizontal
		return true;
	else if(board[0] == board[3] && board[6] == board[0])//1st vertical
		return true;
	else if(board[1] == board[4] && board[7] == board[1])//2nd vertical
		return true;
	else if(board[2] == board[5] && board[8] == board[2])//3rd vertical
		return true;
	else if(board[0] == board[4] && board[8] == board[0])//1st diagonal
		return true;
	else if(board[6] == board[4] && board[2] == board[6])//2nd diagonal
		return true;
	else
		return false;
        }

void GetPlayerMove(bool whichPlayer)
        {
                int choice;
                cout << "Enter Your Move: ";
                cin >> choice;

				
	while(choice > 9)
	{
		cout << "Invaild Move!" << endl;
		cout << "Enter number between 1 to 9 ONLY!" << endl;
		cout << "Enter your move again!" << endl;

		cin >> choice;
	}
                if(CorrectDrop(choice))
                        {
                                if(whichPlayer == true)
                                board[choice-1] = 'X';
                                else
                                board[choice] = 'O';
                        }
                else
                        GetPlayerMove(whichPlayer);
                        display();
        }

  // This is the ai part 
void GetAIMove(bool whichPlayer)
        {
			int choice;
			cout << "Computer's Move: " << endl;
			cin >> choice;

							if(board[0] == 'O' && board[1] == 'O' && board[0] != ' ') {
								board[2] = 'O';}

							else if(board[3] == 'O' && board[4] == 'O' && board[3] != ' ') {
								board[5] = 'O';}

							else if(board[6] == 'O' && board[7] == 'O' && board[6] != ' ') {
								board[8] = 'O';}

							else if(board[0] == 'O' && board[3] == 'O' && board[0] != ' ') {
								board[6] = 'O';}

							else if(board[1] == 'O' && board[4] == 'O' && board[1] != ' ') {
								board[7] = 'O';}

							else if(board[2] == 'O' && board[5] == 'O' && board[2] != ' ') {
								board[8] = 'O';}

							else if(board[0] == 'O' && board[4] == 'O' && board[0] != ' ') {
								board[8] = 'O';}

							else if(board[8] == 'O' && board[4] == 'O' && board[8] != ' ') {
								board[0] = 'O';}

							else if(board[6] == 'O' && board[4] == 'O' && board[6] != ' ') {
								board[2] = 'O'; }


                if(CorrectDrop(choice))
                        {
                                if(whichPlayer == true)
                                board[choice] = 'X';
                                else
                                board[choice-1] = 'O';
                        }
                else
                        GetAIMove(whichPlayer);
                        display();
        }


bool CorrectDrop(int choice)
        {
                if(board[choice-1] == 'X' || board[choice-1] == 'O')
                return false;
                else
                return true;
        }

What should my choice = to?

[kaseron]

Why are you having a cin for a move that is not made by a human?

Add the final else as choice2=rand()%9. Also, you need to make another for the fact that the computer should know to block winning situations, but only let it go to that whole rigmarole if it passes a rand()%100 greater than a certain number (otherwise it would be unbeatable, no fun.) If it fails to be greater than a certain number, then make it run the random.

Good recursion under the if(correctdrop()), but I would suggest calling the computer's choice choice2. Just a preference.

Next time, though, try making a program that can play Calvinball. O_o