Thread: passing a false boolean value into functions, then return it as true to stop program?

I want to pass a boolean value, bool gameover(false), into the function check_winning_condition, and then pass it to function
ask_rematch. Then in ask_rematch, if the user's input is "no", then return the boolean gameover as true to stop the game.

How do I do this? Or is there a better alternative to this? Am I making things harder?

Code:

#include <iostream>


using namespace std;


void show_board(char board[][3]);






int ask_rematch(char board[][3], bool gameover)
{   string rematch;
    std::cout << "Would you like a rematch? yes/no \n";
    std::cin >> rematch;
    if ( rematch == "yes")
    {
         board[0][0] = '1'; board[0][1] = '2'; board[0][2] = '3';
         board[1][0] = '4'; board[1][1] = '5'; board[1][2] = '6';
         board[2][0] = '7'; board[2][1] = '8'; board[2][2] = '9';
    }
    else if ( rematch == "no")
    {
        gameover = true;
        return gameover;
    }


}


int check_winning_condition(char board[][3],string player[],bool gameover)
{
    if ((board[0][0] ==  'X' && board[0][1] == 'X' && board[0][2] == 'X')||
        (board[1][0] ==  'X' && board[1][1] == 'X' && board[1][2] == 'X')||
        (board[2][0] ==  'X' && board[2][1] == 'X' && board[2][2] == 'X')||
        (board[0][0] ==  'X' && board[1][0] == 'X' && board[2][0] == 'X')||
        (board[0][1] ==  'X' && board[1][1] == 'X' && board[2][1] == 'X')||
        (board[0][2] ==  'X' && board[1][2] == 'X' && board[2][2] == 'X')||
        (board[2][0] ==  'X' && board[1][1] == 'X' && board[0][2] == 'X')||
        (board[0][0] ==  'X' && board[1][1] == 'X' && board[2][2] == 'X'))
        {
            std::cout << player[0] << " WINS!\n";
            show_board(board);
            ask_rematch(board,gameover);
            return gameover;


        }
        else if
       ((board[0][0] ==  'O' && board[0][1] == 'O' && board[0][2] == 'O')||
        (board[1][0] ==  'O' && board[1][1] == 'O' && board[1][2] == 'O')||
        (board[2][0] ==  'O' && board[2][1] == 'O' && board[2][2] == 'O')||
        (board[0][0] ==  'O' && board[1][0] == 'O' && board[2][0] == 'O')||
        (board[0][1] ==  'O' && board[1][1] == 'O' && board[2][1] == 'O')||
        (board[0][2] ==  'O' && board[1][2] == 'O' && board[2][2] == 'O')||
        (board[2][0] ==  'O' && board[1][1] == 'O' && board[0][2] == 'O')||
        (board[0][0] ==  'O' && board[1][1] == 'O' && board[2][2] == 'O'))
        {
            std::cout << player[1] << " WINS!\n";
            show_board(board);
            ask_rematch(board,gameover);
            return gameover;


        }
















}


void get_player_names(string player[])
{   string player1, player2;
    std::cout << "Player 1's name: ";
    std::getline(cin, player1);
    std::cout << "\n";
    std::cout << "Player 2's name: ";
    std::getline(cin, player2);
    std::cout << "\n";


    player[0] = player1;
    player[1] = player2;


}


int  game_start(char board[][3],string player[])
{
    bool gameover(false);






    int turn = 0; //players' turn


    do{


                char mark;
    show_board(board);
    std::cout << player[turn] << "'s move.\n";
    std::cout << "Pick the number to mark. \n";
    std::cin  >> mark;






        for ( int row=0;row<3;row++ )
        {
            for (int column=0;column<3;column++)
            {
                if(turn == 0 && mark == board[row][column] && mark != 'O')
                { board[row][column] = 'X';
                  turn = 1;
                  }
                else if (turn == 1 && mark == board[row][column] && mark != 'X')
                { board[row][column] = 'O';
                  turn = 0;
                  }
            }


         }
         check_winning_condition(board,player,gameover);




    }
    while(!gameover);


}


void show_board(char board[][3])
{
    for (int row=0;row<3;row++)
    {
        for (int column=0;column<3;column++)
        {
            std::cout << board[row][column] << " ";
        }
        std::cout << endl << endl;
    }
}


int main()
{
    char board[3][3] = { {'1','2','3'} ,
                         {'4','5','6'} ,
                         {'7','8','9'}  };
   string player[2];
   get_player_names(player);
   game_start(board,player);


   return 0;
}

but the bool gameover is declared in game_start, then passed to check_winning_condition, then passed to ask_rematch, to change its value to true. sorry I still can't comprehend.

even after I type "no", and make change the gameover from false to true, the loop still continues. Am I doing it right?

If you want to do it that way, then you should pass gameover by reference.

You mean to add the & before bool gameover? I had read this somewhere but was not sure how to use it.

Code:

int ask_rematch(char board[][3], bool &gameover)

Code:

int check_winning_condition(char board[][3],string player[],bool &gameover)

After this it ran the way I want it to be. After I type "no", the program exits. Thanks.