How to determine a draw in Tic-Tac-Toe Program?

[MisterTams]

How can I make a draw happen? When all 9 turns are used but no one has won or lost?

//Practice making a Tic-Tac-Toe game
#include <iostream>
#include <string>
#include <iomanip>
using namespace std;

char symbol, Player1;
const int ROW = 3;
const int COLUMN = 3;
int location;
int gameover = 0;
char Board[ROW][COLUMN] =  {
		{'1','2','3'},
		{'4','5','6'},
		{'7','8','9'}				
						};
//function prototype
void LocationLetterO();
void LocationLetterX();
void PrintBoard();
int  CheckWinner();
int  FunctionO();
int  FunctionX();

int main ()
{
	cout << "Welcome to Tic-Tac-Toe!" << endl;
	cout << "__________________________________" << endl;
	cout << "Player 1 please choose (X) or (O)." << endl;
	cin >> symbol;

	while (symbol != 'o' && symbol != 'O' && symbol != 'x' && symbol != 'X')
	{
		cout << "Invalid Request. Player 1, please choose (X) or (O)." << endl;
		cin.clear();
		cin.ignore();
		cin >> symbol;
	}

	if (symbol == 'o' || symbol == 'O')
	{
		cout << "Player 1 chose: O" << endl;
		cout << "Player 2 is now: X\n" << endl;
		Player1 = 'O';
		PrintBoard();
		FunctionO();
	}
	else if (symbol == 'x' || symbol == 'X')
	{
		cout << "Player 1 chose: X" << endl;
		cout << "Player 2 is now: O\n" << endl;
		Player1 = 'X';
		PrintBoard();
		FunctionX();
	}

return 0;
}

void LocationLetterO()
{
	if (location == 1)
		Board[0][0] = 'O';
	else if (location == 2)
		Board[0][1] = 'O';
	else if (location == 3)
		Board[0][2] = 'O';
	else if (location == 4)
		Board[1][0] = 'O';
	else if (location == 5)
		Board[1][1] = 'O';
	else if (location == 6)
		Board[1][2] = 'O';
	else if (location == 7)
		Board[2][0] = 'O';
	else if (location == 8)
		Board[2][1] = 'O';
	else if (location == 9)
		Board[2][2] = 'O';
}

void LocationLetterX()
{
	if (location == 1)
		Board[0][0] = 'X';
	else if (location == 2)
		Board[0][1] = 'X';
	else if (location == 3)
		Board[0][2] = 'X';
	else if (location == 4)
		Board[1][0] = 'X';
	else if (location == 5)
		Board[1][1] = 'X';
	else if (location == 6)
		Board[1][2] = 'X';
	else if (location == 7)
		Board[2][0] = 'X';
	else if (location == 8)
		Board[2][1] = 'X';
	else if (location == 9)
		Board[2][2] = 'X';
}

int CheckWinner()
{
	if (Board[0][0] == Board[0][1] && Board[0][1] == Board[0][2])
	{
		if(Board[0][0] == 'O')
		{
			cout << "\nWinner: O" << endl;
			cout << "Loser: X" << endl;
		}
		else
		{
			cout << "\nWinner: X" << endl;
			cout << "Loser: O" << endl;
		}
		return gameover = 1;
	}
	else if (Board[0][0] == Board[1][1] && Board[1][1] == Board[2][2])
	{
		if(Board[0][0] == 'O')
		{
			cout << "\nWinner: O" << endl;
			cout << "Loser: X" << endl;
		}
		else
		{
			cout << "\nWinner: X" << endl;
			cout << "Loser: O" << endl;
		}
		return gameover = 1;
	}
	else if (Board[1][0] == Board[1][1] && Board[1][1] == Board[1][2])
	{
		if(Board[1][0] == 'O')
		{
			cout << "\nWinner: O" << endl;
			cout << "Loser: X" << endl;
		}
		else
		{
			cout << "\nWinner: X" << endl;
			cout << "Loser: O" << endl;
		}
		return gameover = 1;
	}
	else if (Board[2][0] == Board[2][1] && Board[2][1] == Board[2][2])
	{
		if(Board[2][0] == 'O')
		{
			cout << "\nWinner: O" << endl;
			cout << "Loser: X" << endl;
		}
		else
		{
			cout << "\nWinner: X" << endl;
			cout << "Loser: O" << endl;
		}
		return gameover = 1;
	}
	else if (Board[0][2] == Board[1][1] && Board[1][1] == Board[2][0])
	{
		if(Board[0][2] == 'O')
		{
			cout << "\nWinner: O" << endl;
			cout << "Loser: X" << endl;
		}
		else
		{
			cout << "\nWinner: X" << endl;
			cout << "Loser: O" << endl;
		}
		return gameover = 1;
	}
	else if (Board[0][0] == Board[1][0] && Board[1][0] == Board[2][0])
	{
		if(Board[0][0] == 'O')
		{
			cout << "\nWinner: O" << endl;
			cout << "Loser: X" << endl;
		}
		else
		{
			cout << "\nWinner: X" << endl;
			cout << "Loser: O" << endl;
		}
		return gameover = 1;
	}
	else if (Board[0][1] == Board[1][1] && Board[1][1] == Board[2][1])
	{
		if(Board[0][1] == 'O')
		{
			cout << "\nWinner: O" << endl;
			cout << "Loser: X" << endl;
		}
		else
		{
			cout << "\nWinner: X" << endl;
			cout << "Loser: O" << endl;
		}
		return gameover = 1;
	}
	else if (Board[0][2] == Board[1][2] && Board[1][2] == Board[2][2])
	{
		if(Board[0][2] == 'O')
		{
			cout << "\nWinner: O" << endl;
			cout << "Loser: X" << endl;
		}
		else
		{
			cout << "\nWinner: X" << endl;
			cout << "Loser: O" << endl;
		}
		return gameover = 1;
	}
	else
	{
	return gameover = 0;
	}
}

void PrintBoard()
{
	cout << endl;
	for (int x = 0; x < 3; x++)
	{
		for (int y = 0; y < 3; y++)
	{
		cout << "|" << Board[x][y] << "|";
	}
		cout << endl;
	}
}

int FunctionO()
{
	while (Player1 = 'O')
	{
		
	cout << "\nPlayer 1 (O) choose a location on the board. (1-9) " << endl;
	cin >> location;

	while (location < 1 || location > 9)
	{
		cout << "Invalid Request. Enter a value (1-9)" << endl;
		cin.clear();
		cin.ignore();
		cin >> location;
	}

	LocationLetterO();
	PrintBoard();
	gameover = CheckWinner();

	if (gameover == true)
	{
		cout << "\nThanks for playing!" << endl;
		system("pause");
		return 0;
	}
	
	cout << "\nPlayer 2 (X) choose a location on the board. (1-9) " << endl;
	cin >> location;

	while (location < 1 || location > 9)
	{
		cout << "Invalid Request. Enter a value (1-9)" << endl;
		cin.clear();
		cin.ignore();
		cin >> location;
	}

	LocationLetterX();
	PrintBoard();
	gameover = CheckWinner();

	if (gameover == true)
	{
		cout << "\nThanks for playing!" << endl;
		system("pause");
		return 0;
	}
	}
}

int FunctionX()
{
	while (Player1 = 'X')
	{

	cout << "\nPlayer 1 (X) choose a location on the board. (1-9) " << endl;
	cin >> location;

	while (location < 1 || location > 9)
	{
		cout << "Invalid Request. Enter a value (1-9)" << endl;
		cin.clear();
		cin.ignore();
		cin >> location;
	}

	LocationLetterX();
	PrintBoard();
	gameover = CheckWinner();

	if (gameover == true)
	{
		cout << "\nThanks for playing!" << endl;
		system("pause");
		return 0;
	}
	
	cout << "\nPlayer 2 (O) choose a location on the board. (1-9) " << endl;
	cin >> location;

	while (location < 1 || location > 9)
	{
		cout << "Invalid Request. Enter a value (1-9)" << endl;
		cin.clear();
		cin.ignore();
		cin >> location;
	}

	LocationLetterO();
	PrintBoard();
	gameover = CheckWinner();

	if (gameover == true)
	{
		cout << "\nThanks for playing!" << endl;
		system("pause");
		return 0;
	}
	}
}

[Enot02]

You should have a counter counting the number of turns. When it is 9 and you are on the else path, type "Draw"

[48T7M4Gy]

http://www.cplusplus.com/forum/beginner/205358/