Tic Tac Toe

phone98 (24)
I need help Tic tac toe....

When i make it a Tie it does not display a Tie it just continues...

and Checking Diagonal from Right to left it does not count as a win it just continues playing can someone help me please

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#include<iostream>
#include<iomanip>

using namespace std;

void drawBoard(char board[][3]);
char checkWinner3by3(char board[][3]);

//
// The main funciton is provided for you.
//
// DO NOT MODIFY THE MAIN FUNCTION
//
int main()
{
    // This array of chars represents the game board, and it holds the content
    // of each space. By default all spaces are set to a blank space.
    char board[3][3] = {{' ',' ',' '},{' ',' ',' '},{' ',' ',' '}};
    
    // The current player. Because X plays first, initialize to X
    char player = 'X';
	
    // The winner. either 'X', 'O', or 't' if it's a tie.
    // Or a blank space if the game has not finished.
    char winner = ' ';
	
    // These variables will hold the number of the row and column selected
    // by the players.
    int row;
    int column;
	
    // boolean variables used to verify if the move is valid.
    bool is_move;
    bool is_row;
    bool is_column;

    cout<<"************ TIC TAC TOE ************\n";

    // The game loops again and again until the game is over
    while(winner == ' ')
    {
		//set the boolean variables back to false for a new turn.
        is_move = false; 
        is_row = false;
        is_column = false;
		
        //draw the board.
        drawBoard(board);
				
        // If the game is not yet over show who`s the next player to move
        cout << "Player ";
        if(player == 'X')
        {
            cout << 1;
        }
        else
        {
            cout << 2;
        }
        cout << "'s turn:" << endl;

        // Loop until the player selects a valid space for their move
        is_move = false;
        while(!is_move)
        {  
            // Loop until the player selects a valid row
            // Assume the user inputs a valid integer
            is_row = false;
            while(!is_row)
            {
                cout << "Row: ";
                cin >> row;
                if(row == 1 || row == 2 || row == 3)
                {
                    is_row = true;
                }
                else
                {
                    cout << endl << "Invalid row!" << endl;
                }
            } // end of input row loop
            
            // Loop until the player selects a valid column
            // Assume the user inputs a valid integer
            is_column = false;
            while(!is_column)
            {
                cout << "Column: ";
                cin >> column;
                if(column == 1 || column == 2 || column == 3)
                {
                    is_column = true;
                }
                else
                {
                    cout << endl << "Invalid column!" << endl;
                }
            } // end of input column loop
			
            // If the space is empty, mark the chosen space and swich players
            if(board[row-1][column-1] == ' ')
            {
                // Mark the space and end the player's turn
                board[row-1][column-1] = player;
                is_move = true;
                
                // Switch to the other player
                if(player == 'X')
                {
                    player = 'O';
                }
                else
                {
                    player = 'X';
                }
            } // end of marking space and changing players
            
            // If the space is occupied
            else
            {
                cout<<"The selected space is occupied!" << endl;
                cout << "Select a different space:" << endl << endl;
                drawBoard(board);
            }
        } // end of player's move loop
        
        cout << endl; // for nice output formatting
        
        //check if the player won.
        winner = checkWinner3by3(board);
		
        //If there's a winner
        if(winner == 'X' || winner == 'O')
        {
            drawBoard(board);
            
            //Display congratulations message
            cout<<"Congratulations! Player ";
            if(winner == 'X')
            {
                cout << 1;
            }
            else
            {
                cout << 2;
            }
            cout<<" is the winner!"<<endl;
        }
        else if(winner == 'T')
        {
            drawBoard(board);
            
            //Display a message if it`s tie
            cout << "It's a tie!" << endl;
        }
        
    } // End of player's turn loop
	cout << endl;
    system("pause");
    return 0;
}


//
// Prints the game board
// We know the board is 3 by 3 so we don't need to have the number of rows as
// a parameter.
//
// WRITE THIS FUNCTION
//
void drawBoard(char board[][3])
{
	cout << "    1   2   3   " << endl;
	for(int i = 0; i < 3; i++)
	{
		
		cout << "  +---+---+---+";
		cout << endl;
		cout << i + 1;
		for(int j = 0; j < 3; j++)
		{
			
			cout << " | " << board[i][j];
		}
		cout << " | ";
		cout << endl;
	}
	cout << "  +---+---+---+";
	cout << endl;
}

//
// Checks the whole board if there is a winner.
// We know the board is 3 by 3 so we don't need to have the number of rows as
// a parameter.
//
// WRITE THIS FUNCTION
//
char checkWinner3by3(char board[][3])
{
    // Check all rows

		//Checking For 'X'
			//Rows
		if(board[0][0] == 'X' && board[0][1] == 'X' && board[0][2] == 'X')
			return 'X';

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

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

		//Checking For 'O'
			//Rows
		if(board[0][0] == 'O' && board[0][1] == 'O' && board[0][2] == 'O')
			return 'O';

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

		if(board[2][0] == 'O' && board[2][1] == 'O' && board[2][2] == 'O')
			return 'O';
	
    
    
    // Check all columns
		//Checking For 'X'
			//Columns
		if(board[0][0] == 'X' && board[1][0] == 'X' && board[2][0] == 'X')
			return 'X';

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

		if(board[0][2] == 'X' && board[1][2] == 'X' && board[2][2] == 'X')
			return 'X';
		//Checking For 'O'
			//Columns
		if(board[0][0] == 'O' && board[1][0] == 'O' && board[2][0] == 'O')
			return 'O';

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

		if(board[0][2] == 'O' && board[1][2] == 'O' && board[2][2] == 'O')
			return 'O';
    
    
    // Check diagional from upper left to lower right
		//Checking for 'X'
			//Diagonal Left --> Right
		if(board[0][0] == 'X' && board[1][1] == 'X' && board[2][2] == 'X')
			return 'X';
		//Checkin for 'O'
			//Diagonal Left --> Right
		if(board[0][0] == 'O' && board[1][1] == 'O' && board[2][2] == 'O')
			return 'O';
    
    
    // Check diagonal from upper right to lower left
		//Checking For 'X'
			//Diagonal Right --> Left
		if (board[2][0] == 'X' && board[1][1] == 'X' && board[0][2] == 'X')
        return 'X';

		//Checking For 'O'
			//Diagonal Right --> Left

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

    
    
    // Otherwise, if all spaces are filled, the game is a tie
		else
			return 'T';
    
    // If none of the conditions above are true, return a blank space

}
arzhon (25)
I just made some modification to your code to get it working
and obviously, it is not the best way, but it might gives you another perspective:

I haven't tested all the possible ending, and I have formatted the changed codes in bold.

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#include<iostream>
#include<iomanip>

using namespace std;

void drawBoard(char board[][3]);
char checkWinner3by3(char board[][3], char player, int lastRow, int lastColumn);

//
// The main funciton is provided for you.
//
// DO NOT MODIFY THE MAIN FUNCTION
//
int main()
{
    // This array of chars represents the game board, and it holds the content
    // of each space. By default all spaces are set to a blank space.
    char board[3][3] = {{' ',' ',' '},{' ',' ',' '},{' ',' ',' '}};

   int steps = 3 * 3; // to check if the game is tie
    
    // The current player. Because X plays first, initialize to X
    char player = 'X';
	
    // The winner. either 'X', 'O', or 't' if it's a tie.
    // Or a blank space if the game has not finished.
    char winner = ' ';
	
    // These variables will hold the number of the row and column selected
    // by the players.
    int row;
    int column;
	
    // boolean variables used to verify if the move is valid.
    bool is_move;
    bool is_row;
    bool is_column;

    cout<<"************ TIC TAC TOE ************\n";

    // The game loops again and again until the game is over
    while(winner == ' ')
    {
		//set the boolean variables back to false for a new turn.
        is_move = false; 
        is_row = false;
        is_column = false;
		
        //draw the board.
        drawBoard(board);
				
        // If the game is not yet over show who`s the next player to move
        cout << "Player ";
        if(player == 'X')
        {
            cout << 1;
        }
        else
        {
            cout << 2;
        }
        cout << "'s turn:" << endl;

        // Loop until the player selects a valid space for their move
        is_move = false;
        while(!is_move)
        {  
            // Loop until the player selects a valid row
            // Assume the user inputs a valid integer
            is_row = false;
            while(!is_row)
            {
                cout << "Row: ";
                cin >> row;
                if(row == 1 || row == 2 || row == 3)
                {
                    is_row = true;
                }
                else
                {
                    cout << endl << "Invalid row!" << endl;
                }
            } // end of input row loop
            
            // Loop until the player selects a valid column
            // Assume the user inputs a valid integer
            is_column = false;
            while(!is_column)
            {
                cout << "Column: ";
                cin >> column;
                if(column == 1 || column == 2 || column == 3)
                {
                    is_column = true;
                }
                else
                {
                    cout << endl << "Invalid column!" << endl;
                }
            } // end of input column loop
			
            // If the space is empty, mark the chosen space and swich players
            if(board[row-1][column-1] == ' ')
            {
                // Mark the space and end the player's turn
                board[row-1][column-1] = player;
                is_move = true;
                --steps;

                // check if the player won.
        	winner = checkWinner3by3(board, player, row - 1, column - 1);

        	// check if steps are out and still no winner, game is tie
        	if(steps == 0 && winner == ' '){
        		winner = 'T';
        	}

                // Switch to the other player
                if(player == 'X')
                {
                    player = 'O';
                }
                else
                {
                    player = 'X';
                }
            } // end of marking space and changing players
            
            // If the space is occupied
            else
            {
                cout<<"The selected space is occupied!" << endl;
                cout << "Select a different space:" << endl << endl;
                drawBoard(board);
            }
        } // end of player's move loop
        
        cout << endl; // for nice output formatting
		
        //If there's a winner
        if(winner == 'X' || winner == 'O')
        {
            drawBoard(board);
            
            //Display congratulations message
            cout<<"Congratulations! Player ";
            if(winner == 'X')
            {
                cout << 1;
            }
            else
            {
                cout << 2;
            }
            cout<<" is the winner!"<<endl;
        }
        else if(winner == 'T')
        {
            drawBoard(board);
            
            //Display a message if it`s tie
            cout << "It's a tie!" << endl;
        }
        
    } // End of player's turn loop
	cout << endl;
    cin.get();
    return 0;
}

//
// Prints the game board
// We know the board is 3 by 3 so we don't need to have the number of rows as
// a parameter.
//
// WRITE THIS FUNCTION
//
void drawBoard(char board[][3])
{
	cout << "    1   2   3   " << endl;
	for(int i = 0; i < 3; i++)
	{
		
		cout << "  +---+---+---+";
		cout << endl;
		cout << i + 1;
		for(int j = 0; j < 3; j++)
		{
			
			cout << " | " << board[i][j];
		}
		cout << " | ";
		cout << endl;
	}
	cout << "  +---+---+---+";
	cout << endl;
}

//
// Checks the whole board if there is a winner.
// We know the board is 3 by 3 so we don't need to have the number of rows as
// a parameter.
//
// WRITE THIS FUNCTION
//
char checkWinner3by3(char board[][3], char player, int lastRow, int lastColumn)
{
	// check for both the diaglonals
	if(lastRow == lastColumn){
		for(int a = 0; a < 3; a++){
			if(board[a][a] != player)
				break;
			if(a == 2)
				return player;
		}
	}else if(lastRow + lastColumn == 2){
		for(int a = 0; a < 3; a++){
			if(board[a][2 - a] != player)
				break;
			if(a == 2)
				return player;
		}
	}

	// check for rows
	for(int a = 0; a < 3; a++){
		if(board[lastRow][a] != player)
			break;
		if(a == 2)
			return player;
	}

	// check for columns
	for(int a = 0; a < 3; a++){
		if(board[a][lastColumn] != player)
			break;
		if(a == 2)
			return player;
	}

	// check for tie
	// you may determine TIE here (pass the steps variable here)
	// or do it in the main function like I did

	// no winner yet
	return ' ';
}
Last edited on
phone98 (24)
Well it works the way it should... It did opened door of what i should do Thanks although i still dont know why my diagonal Right to left is not working.... and my Left to right is...

Thanks again i made a lil more modifications

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