Tic Tac Toe help

Hello! I am new to programming. A couple of days ago i came across some videos of thenewboston and i found them really interesting, so i really got into programming and C++. I also found this website with some helpful exercises so i tried to do them (http://www.cplusplus.com/forum/articles/12974/). I am currently stuck on the Tic Tac Toe...
I am sorry in advance for the code, i am sure it is really bad and messy but i just went with the flow and the little that i know of this language, and started writing stuff (same mistake won't happen again). I revised my code and added some comments where i think its wrong, any kind of help will really be appreciated! :)

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#include <iostream>
#include <cstdlib>

using namespace std;

void board();
int CheckGame();
int PlayAgain();
int ClearBoard();

bool draw = false;
bool RunningGame = true;
char square[9] = {'1','2','3','4','5','6','7','8','9'};
int mark;
char answer;

int main()
{
    ClearBoard();

    do{
    while(RunningGame == true)
    {
        board();
        cout<<"Player 1 choose a number: ";
        cin>>mark;
        while(mark!=1 && mark!=2 && mark!=3 && mark!=4 && mark!=5 && mark!=6 && mark!=7 && mark!=8 && mark!=9)//Works for numbers, but not for letters
        {
            cout<<"Wrong input. Try again: ";
            cin>>mark;
        }
        square[--mark]='X';
        system("CLS");
        CheckGame();

        if(RunningGame == false && draw == false)
        {
            system("CLS");
            cout<<"Player 1 won!"<<endl;
            break;
        }

        board();
        cout<<"Player 2 choose a number: ";
        cin>>mark;
        while(mark!=1 && mark!=2 && mark!=3 && mark!=4 && mark!=5 && mark!=6 && mark!=7 && mark!=8 && mark!=9)//Works for numbers, but not for letters
        {
            cout<<"Wrong input. Try again: ";
            cin>>mark;
        }
        square[--mark]='O';
        system("CLS");
        CheckGame();

        if(RunningGame == false && draw == false)
        {
            system("CLS");
            cout<<"Player 2 won!"<<endl;
            break;
        }
        CheckGame();

        if(RunningGame == false && draw == true)//Doesn't work
        {
            system("CLS");
            cout<<"The game ended in a draw!"<<endl;
            break;
        }
    }
    PlayAgain();
    }while(RunningGame == true);


    return 0;
}

void board()
{
	system("cls");
	cout << "\n\n\t\t   Tic Tac Toe\n\n";

	cout << "\t   Player 1 (X)  -  Player 2 (O)" << endl << endl;
	cout << endl;

	cout << "\t\t     |     |     " << endl;
	cout << "\t\t  " << square[0] << "  |  " << square[1] << "  |  " << square[2] << endl;

	cout << "\t\t_____|_____|_____" << endl;
	cout << "\t\t     |     |     " << endl;

	cout << "\t\t  " << square[3] << "  |  " << square[4] << "  |  " << square[5] << endl;

	cout << "\t\t_____|_____|_____" << endl;
	cout << "\t\t     |     |     " << endl;

	cout << "\t\t  " << square[6] << "  |  " << square[7] << "  |  " << square[8] << endl;

	cout << "\t\t     |     |     " << endl << endl;
}

int CheckGame()
{
    if (square[0] == square[1] && square[1] == square[2])
		RunningGame = false;

	else if (square[3] == square[4] && square[4] == square[5])
		RunningGame = false;

	else if (square[6] == square[7] && square[7] == square[8])
		RunningGame = false;

	else if (square[0] == square[3] && square[3] == square[6])
		RunningGame = false;

	else if (square[3] == square[4] && square[4] == square[7])
		RunningGame = false;

	else if (square[2] == square[5] && square[5] == square[8])
		RunningGame = false;

	else if (square[0] == square[4] && square[4] == square[8])
		RunningGame = false;

	else if (square[2] == square[4] && square[4] == square[6])
		RunningGame = false;

    else if (square[0] != '1' && square[1] != '2' && square[2] != '3' && square[3] != '4' && square[4] != '5' && square[5] != '6'
             && square[6] != '7' && square[7] != '8' && square[8] != '9')
             {
                draw = true;
                RunningGame = false;
             }
}

int PlayAgain()
{
    cout<<"Would you like to play again?(Y/N)"<<endl;
    cin>>answer;

    while(answer != 'Y' && answer != 'N')
    {
        system("Cls");
        cout<<"Wrong input. Please type \"Y\" or \"N\"."<<endl;
        cin>>answer;
        if(answer=='Y')
        {
            system("CLS");
            ClearBoard();
            RunningGame = true;
        }
        else if(answer=='N')
        {
            break;
            system("Cls");
        }
    }

    if(answer=='Y')
    {
        system("CLS");
        ClearBoard();
        RunningGame = true;
    }
    else if(answer=='N')
    {
        system("Cls");
        return 0;
    }

}

int ClearBoard()
{
    char square[9] = {'1','2','3','4','5','6','7','8','9'};//This doesnt do anything, i thought it would give back the original elements to the array
}
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