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Tic Tac Toe game help

Doe (2)
Hello I am working on a Tic Tac Toe game and I am very new at this. I am writing this code with a two-dimensional array and I only know how to have players input but the question I am asking is how would I allow it to be played against the computer?

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#include <iostream>
using namespace std;
char matrix[3][3] = { '1', '2', '3', '4', '5', '6', '7', '8', '9' };
char player = 'X';
int n;
void Draw()
{
	system("cls");
	cout << "Tic Tac Toe v1.0" << endl;
	for (int i = 0; i < 3; i++)
	{
		for (int j = 0; j < 3; j++)
		{
			cout << matrix[i][j] << " ";
		}
		cout << endl;
	}
}
void Input()
{
	int a;
	cout << "It's " << player << " turn. " << "Press the number of the field: ";
	cin >> a;

	if (a == 1)
	{
		if (matrix[0][0] == '1')
			matrix[0][0] = player;
		else
		{
			cout << "Field is already in use try again!" << endl;
			Input();
		}
	}
	else if (a == 2)
	{
		if (matrix[0][1] == '2')
			matrix[0][1] = player;
		else
		{
			cout << "Field is already in use try again!" << endl;
			Input();
		}
	}
	else if (a == 3)
	{
		if (matrix[0][2] == '3')
			matrix[0][2] = player;
		else
		{
			cout << "Field is already in use try again!" << endl;
			Input();
		}
	}
	else if (a == 4)
	{
		if (matrix[1][0] == '4')
			matrix[1][0] = player;
		else
		{
			cout << "Field is already in use try again!" << endl;
			Input();
		}
	}
	else if (a == 5)
	{
		if (matrix[1][1] == '5')
			matrix[1][1] = player;
		else
		{
			cout << "Field is already in use try again!" << endl;
			Input();
		}
	}
	else if (a == 6)
	{
		if (matrix[1][2] == '6')
			matrix[1][2] = player;
		else
		{
			cout << "Field is already in use try again!" << endl;
			Input();
		}
	}
	else if (a == 7)
	{
		if (matrix[2][0] == '7')
			matrix[2][0] = player;
		else
		{
			cout << "Field is already in use try again!" << endl;
			Input();
		}
	}
	else if (a == 8)
	{
		if (matrix[2][1] == '8')
			matrix[2][1] = player;
		else
		{
			cout << "Field is already in use try again!" << endl;
			Input();
		}
	}
	else if (a == 9)
	{
		if (matrix[2][2] == '9')
			matrix[2][2] = player;
		else
		{
			cout << "Field is already in use try again!" << endl;
			Input();
		}
	}

}
void TogglePlayer()
{
	if (player == 'X')
		player = 'O';
	else
		player = 'X';
}


char Win()
{
	//first player
	if (matrix[0][0] == 'X' && matrix[0][1] == 'X' && matrix[0][2] == 'X')
		return 'X';
	if (matrix[1][0] == 'X' && matrix[1][1] == 'X' && matrix[1][2] == 'X')
		return 'X';
	if (matrix[2][0] == 'X' && matrix[2][1] == 'X' && matrix[2][2] == 'X')
		return 'X';

	if (matrix[0][0] == 'X' && matrix[1][0] == 'X' && matrix[2][0] == 'X')
		return 'X';
	if (matrix[0][1] == 'X' && matrix[1][1] == 'X' && matrix[2][1] == 'X')
		return 'X';
	if (matrix[0][2] == 'X' && matrix[1][2] == 'X' && matrix[2][2] == 'X')
		return 'X';

	if (matrix[0][0] == 'X' && matrix[1][1] == 'X' && matrix[2][2] == 'X')
		return 'X';
	if (matrix[2][0] == 'X' && matrix[1][1] == 'X' && matrix[0][2] == 'X')
		return 'X';

	//computer player
	if (matrix[0][0] == 'O' && matrix[0][1] == 'O' && matrix[0][2] == 'O')
		return 'O';
	if (matrix[1][0] == 'O' && matrix[1][1] == 'O' && matrix[1][2] == 'O')
		return 'O';
	if (matrix[2][0] == 'O' && matrix[2][1] == 'O' && matrix[2][2] == 'O')
		return 'O';

	if (matrix[0][0] == 'O' && matrix[1][0] == 'O' && matrix[2][0] == 'O')
		return 'O';
	if (matrix[0][1] == 'O' && matrix[1][1] == 'O' && matrix[2][1] == 'O')
		return 'O';
	if (matrix[0][2] == 'O' && matrix[1][2] == 'O' && matrix[2][2] == 'O')
		return 'O';

	if (matrix[0][0] == 'O' && matrix[1][1] == 'O' && matrix[2][2] == 'O')
		return 'O';
	if (matrix[2][0] == 'O' && matrix[1][1] == 'O' && matrix[0][2] == 'O')
		return 'O';

	return '/';
}
int main()
{
	n = 0;
	Draw();
	while (1)
	{
		n++;
		Input();
		Draw();
		if (Win() == 'X')
		{
			cout << "Player wins!" << endl;
			break;
		}
		else if (Win() == 'O')
		{
			cout << "Computer wins!" << endl;
			break;
		}
		else if (Win() == '/' && n == 9)
		{
			cout << "It's a draw!" << endl;
			break;
		}
		TogglePlayer();
	}
	system("pause");
	return 0;
}
chicofeo (640)
Have you searched on the forum?
http://www.cplusplus.com/search.do?q=Tic+tac+toe

It has plenty of examples.
AbstractionAnon (6954)
Lines 3-5: Globals should be avoided.

Line 9: You probably don't want to output this every time you draw the grid.

Lines 25-114: Do you see a lot of repeated code here? That's a good indication you need a loop and/or a function call.

Lines 129-146, 149-166: The only difference between these two groups of lines is which player is being checked. Again, This can be rewritten as a function, passing the player as an argument.

I am asking is how would I allow it to be played against the computer?

That can be as simple or as complex as you like.

At the simple end of the spectrum, have the computer randomly take any empty cell.

At the more complex end of the spectrum, have the computer look for patterns. First check if the computer already has two in a row. If so, complete that row. If the computer doesn't have two in a row, see if the player has two in a row and block.

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