Delete the created progress bars by pushing button on the console window - qt

Question

I am trying to learn myself use Qt so still struggling a lot... How would I go about deleting my bouncing object by pressing the delete button? I am struggling to implement the delete function...
MainWindow::MainWindow(QWidget * parent): QMainWindow(parent) {
setFixedSize(800, 600);
int start;
timer = new QTimer(this);
connect(timer , SIGNAL(timeout()), this, SLOT(step()));
timer -> setInterval(5);
timer -> start();
QPushButton * sillyLabel = new QPushButton(this);
connect(sillyLabel , SIGNAL(clicked()), this, SLOT(doSomethingSilly()));
sillyLabel -> setText("Spawn Object");
sillyLabel -> setGeometry(400, 400, 200, 50);
QPushButton * dLabel = new QPushButton(this);
connect(dLabel , SIGNAL(clicked()), this, SLOT(deleteSomethingSilly()));
dLabel -> setText("Delete Object");
dLabel -> setGeometry(200, 200, 200, 50);
MainWindow::~MainWindow() {
}
void MainWindow::doSomethingSilly() {
QProgressBar * sillyobject = new QProgressBar(this);
sillyobject -> setGeometry(400, 300, 80, 50);
sillyobject -> show();
sillyobject -> setValue(100);
bouncyobject.push_back(sillyobject);
}
void MainWindow::deleteSomethingSilly() {
delete ?;
}

Answer 1

You have to declare sillyobject inside the class header as a private pointer (to have access inside all the class members), then you just have to delete the pointer with :
delete sillyobject;
In your header file :
(...)
private :
QProgressBar * sillyobject
(...)
then
void MainWindow::doSomethingSilly() {
sillyobject = new QProgressBar(this);
sillyobject -> setGeometry(400, 300, 80, 50);
sillyobject -> show();
sillyobject -> setValue(100);
bouncyobject.push_back(sillyobject);
}
and :
void MainWindow::deleteSomethingSilly() {
delete sillyobject;
}