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logic bug

adam2016 (1529)
i guys am using qt to make a simple x and o gui,

whenever I click on button number 9,it will seem to end the game

can anyone spot why? I've scanned through the code a few times and can't see why it's setting gameover to true

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#include "mainwindow.h"
#include "ui_mainwindow.h"
#include <QMessageBox>


MainWindow::MainWindow(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::MainWindow)
{
    ui->setupUi(this);
    gameOver = false;
    draw = false;
    playerOne = true;
    playerTwo = false;

    for(int i = 0; i < 9; i++)
        buttonPushed[i] = false;
    QPalette sample_palette;
    sample_palette.setColor(QPalette::Window, Qt::transparent);
    sample_palette.setColor(QPalette::WindowText, Qt::red);

    ui->label->setAutoFillBackground(true);
    ui->label->setPalette(sample_palette);
}

MainWindow::~MainWindow()
{
    delete ui;
}

void MainWindow::displayTurn(){

    if(playerOne)
    ui->label->setText("<b>Player one turn</b>");

    if(playerTwo)
    ui->label->setText("<b>Player two turn</b>");

}

void MainWindow::reset(){

    gameOver = false;
    playerOne = true;
    playerTwo = false;

    for(int i = 0; i < 9; i++)
        buttonPushed[i] = false;

    ui->pushButton->setText("  -  ");
    ui->pushButton_2->setText("  -  ");
    ui->pushButton_3->setText("  -  ");
    ui->pushButton_4->setText("  -  ");
    ui->pushButton_5->setText("  -  ");
    ui->pushButton_6->setText("  -  ");
    ui->pushButton_7->setText("  -  ");
    ui->pushButton_8->setText("  -  ");
    ui->pushButton_9->setText("  -  ");

}

void MainWindow::playAgain(){


    QMessageBox msgBox;
    msgBox.setText("do you want to play again?");
    QPushButton *yesButton = msgBox.addButton(tr("Yes"), QMessageBox::ActionRole);
    QPushButton *noButton = msgBox.addButton(tr("No"), QMessageBox::ActionRole);
    msgBox.exec();

    if(msgBox.clickedButton() == yesButton){

        reset();
        return;
    }
    if(msgBox.clickedButton() == noButton){

        this->close();
    }
}

bool MainWindow::isGameOver(){


    if(ui->pushButton->text() == "  X  " && ui->pushButton_2->text() == "  X  "
         &&  ui->pushButton_3->text() == "  X  "){
                ui->label->setText("<b>GAME OVER PLAYER ONE WINS!</b>");
                return true;
    }

    if(ui->pushButton_4->text() == "  X  " && ui->pushButton_5->text() == "  X  "
            &&  ui->pushButton_6->text() == "  X  "){
                ui->label->setText("<b>GAME OVER PLAYER ONE WINS!</b>");
                return true;
    }
    if(ui->pushButton_7->text() == "  X  " && ui->pushButton_8->text() == "  X  "
            &&  ui->pushButton_9->text() == "  X  "){
                ui->label->setText("<b>GAME OVER PLAYER ONE WINS!</b>");
                return true;
    }

    if(ui->pushButton->text() == "  O  " && ui->pushButton_2->text() == "  O  "
         &&  ui->pushButton_3->text() == "  O  "){
                ui->label->setText("<b>GAME OVER PLAYER TWO WINS!</b>");
                return true;
    }

    if(ui->pushButton_4->text() == "  O  " && ui->pushButton_5->text() == "  O  "
            &&  ui->pushButton_6->text() == "  O  "){
                ui->label->setText("<b>GAME OVER PLAYER TWO WINS!</b>");
                return true;
    }
    if(ui->pushButton_7->text() == "  O  " && ui->pushButton_8->text() == "  O  "
            &&  ui->pushButton_9->text() == "  O  "){
                ui->label->setText("<b>GAME OVER PLAYER TWO WINS!</b>");
                return true;
    }

    if(ui->pushButton->text() == "  X  " && ui->pushButton_5->text() == "  X  "
            &&  ui->pushButton_9->text() == "  X  "){
                ui->label->setText("<b>GAME OVER PLAYER ONE WINS!</b>");
                return true;
    }
    if(ui->pushButton_3->text() == "  X  " && ui->pushButton_5->text() == "  X  "
            &&  ui->pushButton_7->text() == "  X  "){
                ui->label->setText("<b>GAME OVER PLAYER ONE WINS!</b>");
                return true;
    }

    if(ui->pushButton->text() == "  O  " && ui->pushButton_5->text() == "  O  "
            &&  ui->pushButton_9->text() == "  O  "){
                 ui->label->setText("<b>GAME OVER PLAYER TWO WINS!</b>");
                return true;
    }
    if(ui->pushButton_3->text() == "  O  " && ui->pushButton_5->text() == "  O  "
            &&  ui->pushButton_7->text() == "  O  "){
                ui->label->setText("<b>GAME OVER PLAYER TWO WINS!</b>");
                return true;
    }

    for(int i = 0; i < 9; i++){
        if(!buttonPushed[i]){
            return false;
        }
        draw = true;
        return draw;
    }

    return false;

    // IMPLEMENT DOWNWARD COLS
}

void  MainWindow::buttonsPushed(int number){


    if(playerOne && !buttonPushed[number] && !gameOver){

        buttonPushed[number] = true;

        switch(number){

          case 1:
            ui->pushButton->setText("  X  ");
            break;
           case 2:
            ui->pushButton_2->setText("  X  ");
            break;
          case 3:
            ui->pushButton_3->setText("  X  ");
            break;
        case 4:
            ui->pushButton_4->setText("  X  ");
            break;
        case 5:
            ui->pushButton_5->setText("  X  ");
            break;
        case 6:
            ui->pushButton_6->setText("  X  ");
            break;
           case 7:
            ui->pushButton_7->setText("  X  ");
            break;
        case 8:
            ui->pushButton_8->setText("  X  ");
            break;
        case 9:
            ui->pushButton_9->setText("  X  ");
            break;

        }

        if(isGameOver())
            gameOver = true;

        buttonPushed[number] = true;
        playerOne = false;
        playerTwo = true;

        if(!gameOver)
            displayTurn();
        if(gameOver){
            playAgain();
        }

        return;
    }

    if(playerTwo && !buttonPushed[number] && !gameOver){

        switch(number){

          case 1:
            ui->pushButton->setText("  O  ");
            break;
           case 2:
            ui->pushButton_2->setText("  O  ");
            break;
          case 3:
            ui->pushButton_3->setText("  O  ");
            break;
        case 4:
            ui->pushButton_4->setText("  O  ");
            break;
        case 5:
            ui->pushButton_5->setText("  O  ");
            break;
        case 6:
            ui->pushButton_6->setText("  O  ");
            break;
           case 7:
            ui->pushButton_7->setText("  O  ");
            break;
        case 8:
            ui->pushButton_8->setText("  O  ");
            break;
        case 9:
            ui->pushButton_9->setText("  O  ");
            break;

        }
        if(isGameOver())
            gameOver = true;

         buttonPushed[number] = true;
         playerOne = true;
         playerTwo = false;

         if(!gameOver)
             displayTurn();

         if(gameOver){
             if(draw){
                ui->label->setText("<b> DRAW!</b>");
             }
            playAgain();
         }

         return;
    }
}

void MainWindow::on_pushButton_clicked()
{

  buttonsPushed(1);
}



void MainWindow::on_pushButton_2_clicked()
{
  buttonsPushed(2);
}



void MainWindow::on_pushButton_3_clicked()
{
   buttonsPushed(3);
}

void MainWindow::on_pushButton_4_clicked()
{
    buttonsPushed(4);
}

void MainWindow::on_pushButton_5_clicked()
{
    buttonsPushed(5);
}

void MainWindow::on_pushButton_6_clicked()
{
    buttonsPushed(6);
}

void MainWindow::on_pushButton_7_clicked()
{
    buttonsPushed(7);
}

void MainWindow::on_pushButton_8_clicked()
{
    buttonsPushed(8);
}

void MainWindow::on_pushButton_9_clicked()
{
    buttonsPushed(9);
}
jonnin (11438)

buttonPushed[number] = true; //validate number is in range here. if you had 9 or 10 for number, it could set a different variable (the machine just keeps going and modifies the memory at the location, which could be your game-over flag).

minor suggestions
its a little over-engineered in a few places
eg, instead of having isgameover feeding gameover, just call the isgameover function where you need it.
also player 1 and player 2 are technically unnecessary: either its player1s turn, or its not, and you can toggle this (player1 = !player1) every move without actually needing to track a player2. Its a tossup.. its easier to understand with 2 players, but its more code to track both and flip both etc and a lot of extra effort. This one.. depends on your mindset, I guess, but personally I "usually" find having 2 variables to represent 1 idea is a bad thing.

9 is used as a magic number a lot, consider making a named constant for it and any others. Magic numbers are generally bad practice.

adam2016 (1529)
thanks Jonnin

very true,I actually do go out of bounds in my bool array buttonPushed so I added -1 to the index,

great advice,I should be using constants , and also I could simplify the code a little bit :)

but the problem still persists when I click the last button or pushButton_9 it still ends the
game prematurely.


**Edit

my bad I actually forgot to change the check in the if statement also,the code now works as it should 

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#include "mainwindow.h"
#include "ui_mainwindow.h"
#include <QMessageBox>


MainWindow::MainWindow(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::MainWindow)
{
    ui->setupUi(this);
    gameOver = false;
    draw = false;
    playerOne = true;
    playerTwo = false;

    for(int i = 0; i < 9; i++)
        buttonPushed[i] = false;
    QPalette sample_palette;
    sample_palette.setColor(QPalette::Window, Qt::transparent);
    sample_palette.setColor(QPalette::WindowText, Qt::red);

    ui->label->setAutoFillBackground(true);
    ui->label->setPalette(sample_palette);
}

MainWindow::~MainWindow()
{
    delete ui;
}

void MainWindow::displayTurn(){

    if(playerOne)
    ui->label->setText("<b>Player one turn</b>");

    if(playerTwo)
    ui->label->setText("<b>Player two turn</b>");

}

void MainWindow::reset(){

    gameOver = false;
    playerOne = true;
    playerTwo = false;

    for(int i = 0; i < 9; i++)
        buttonPushed[i] = false;

    ui->pushButton->setText("  -  ");
    ui->pushButton_2->setText("  -  ");
    ui->pushButton_3->setText("  -  ");
    ui->pushButton_4->setText("  -  ");
    ui->pushButton_5->setText("  -  ");
    ui->pushButton_6->setText("  -  ");
    ui->pushButton_7->setText("  -  ");
    ui->pushButton_8->setText("  -  ");
    ui->pushButton_9->setText("  -  ");

}

void MainWindow::playAgain(){


    QMessageBox msgBox;
    msgBox.setText("do you want to play again?");
    QPushButton *yesButton = msgBox.addButton(tr("Yes"), QMessageBox::ActionRole);
    QPushButton *noButton = msgBox.addButton(tr("No"), QMessageBox::ActionRole);
    msgBox.exec();

    if(msgBox.clickedButton() == yesButton){

        reset();
        return;
    }
    if(msgBox.clickedButton() == noButton){

        this->close();
    }
}

bool MainWindow::isGameOver(){


    if(ui->pushButton->text() == "  X  " && ui->pushButton_2->text() == "  X  "
         &&  ui->pushButton_3->text() == "  X  "){
                ui->label->setText("<b>GAME OVER PLAYER ONE WINS!</b>");
                return true;
    }

    if(ui->pushButton_4->text() == "  X  " && ui->pushButton_5->text() == "  X  "
            &&  ui->pushButton_6->text() == "  X  "){
                ui->label->setText("<b>GAME OVER PLAYER ONE WINS!</b>");
                return true;
    }
    if(ui->pushButton_7->text() == "  X  " && ui->pushButton_8->text() == "  X  "
            &&  ui->pushButton_9->text() == "  X  "){
                ui->label->setText("<b>GAME OVER PLAYER ONE WINS!</b>");
                return true;
    }

    if(ui->pushButton->text() == "  O  " && ui->pushButton_2->text() == "  O  "
         &&  ui->pushButton_3->text() == "  O  "){
                ui->label->setText("<b>GAME OVER PLAYER TWO WINS!</b>");
                return true;
    }

    if(ui->pushButton_4->text() == "  O  " && ui->pushButton_5->text() == "  O  "
            &&  ui->pushButton_6->text() == "  O  "){
                ui->label->setText("<b>GAME OVER PLAYER TWO WINS!</b>");
                return true;
    }
    if(ui->pushButton_7->text() == "  O  " && ui->pushButton_8->text() == "  O  "
            &&  ui->pushButton_9->text() == "  O  "){
                ui->label->setText("<b>GAME OVER PLAYER TWO WINS!</b>");
                return true;
    }

    if(ui->pushButton->text() == "  X  " && ui->pushButton_5->text() == "  X  "
            &&  ui->pushButton_9->text() == "  X  "){
                ui->label->setText("<b>GAME OVER PLAYER ONE WINS!</b>");
                return true;
    }
    if(ui->pushButton_3->text() == "  X  " && ui->pushButton_5->text() == "  X  "
            &&  ui->pushButton_7->text() == "  X  "){
                ui->label->setText("<b>GAME OVER PLAYER ONE WINS!</b>");
                return true;
    }

    if(ui->pushButton->text() == "  O  " && ui->pushButton_5->text() == "  O  "
            &&  ui->pushButton_9->text() == "  O  "){
                 ui->label->setText("<b>GAME OVER PLAYER TWO WINS!</b>");
                return true;
    }
    if(ui->pushButton_3->text() == "  O  " && ui->pushButton_5->text() == "  O  "
            &&  ui->pushButton_7->text() == "  O  "){
                ui->label->setText("<b>GAME OVER PLAYER TWO WINS!</b>");
                return true;
    }


    return false;

    // IMPLEMENT DOWNWARD COLS
}

void  MainWindow::buttonsPushed(int number){


    if(playerOne && !buttonPushed[number-1] && !gameOver){

        buttonPushed[number-1] = true;

        switch(number){

          case 1:
            ui->pushButton->setText("  X  ");
            break;
           case 2:
            ui->pushButton_2->setText("  X  ");
            break;
          case 3:
            ui->pushButton_3->setText("  X  ");
            break;
        case 4:
            ui->pushButton_4->setText("  X  ");
            break;
        case 5:
            ui->pushButton_5->setText("  X  ");
            break;
        case 6:
            ui->pushButton_6->setText("  X  ");
            break;
           case 7:
            ui->pushButton_7->setText("  X  ");
            break;
        case 8:
            ui->pushButton_8->setText("  X  ");
            break;
        case 9:
            ui->pushButton_9->setText("  X  ");


        }
        buttonPushed[number-1] = true;

        if(isGameOver())
            gameOver = true;


        playerOne = false;
        playerTwo = true;

        if(!gameOver)
            displayTurn();
        if(gameOver){
            playAgain();
        }

        return;
    }

    if(playerTwo && !buttonPushed[number-1] && !gameOver){

        buttonPushed[number-1] = true;

        switch(number){

          case 1:
            ui->pushButton->setText("  O  ");
            break;
           case 2:
            ui->pushButton_2->setText("  O  ");
            break;
          case 3:
            ui->pushButton_3->setText("  O  ");
            break;
        case 4:
            ui->pushButton_4->setText("  O  ");
            break;
        case 5:
            ui->pushButton_5->setText("  O  ");
            break;
        case 6:
            ui->pushButton_6->setText("  O  ");
            break;
           case 7:
            ui->pushButton_7->setText("  O  ");
            break;
        case 8:
            ui->pushButton_8->setText("  O  ");
            break;
        case 9:
            ui->pushButton_9->setText("  O  ");


        }

        buttonPushed[number-1] = true;

        if(isGameOver())
            gameOver = true;

         playerOne = true;
         playerTwo = false;

         if(!gameOver)
             displayTurn();

         if(gameOver){
             if(draw){
                ui->label->setText("<b> DRAW!</b>");
             }
            playAgain();
         }

         return;
    }
}

void MainWindow::on_pushButton_clicked()
{

  buttonsPushed(1);
}



void MainWindow::on_pushButton_2_clicked()
{
  buttonsPushed(2);
}



void MainWindow::on_pushButton_3_clicked()
{
   buttonsPushed(3);
}

void MainWindow::on_pushButton_4_clicked()
{
    buttonsPushed(4);
}

void MainWindow::on_pushButton_5_clicked()
{
    buttonsPushed(5);
}

void MainWindow::on_pushButton_6_clicked()
{
    buttonsPushed(6);
}

void MainWindow::on_pushButton_7_clicked()
{
    buttonsPushed(7);
}

void MainWindow::on_pushButton_8_clicked()
{
    buttonsPushed(8);
}

void MainWindow::on_pushButton_9_clicked()
{
    buttonsPushed(9);
}

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