c++ 동적할당 및 해제 기초 질문좀 드릴게요

void MainWindow::test()
{
 
	QDialog *messageDialog = new QDialog(this);
	QVBoxLayout *vbox = new QVBoxLayout;
 
	QTextEdit *textEdit = new QTextEdit;
 
	QHBoxLayout *hbox1 = new QHBoxLayout;
	hbox1->addWidget(textEdit);
	vbox->addLayout(hbox1);
 
	QPushButton *okButton = new QPushButton(trUtf8("확인"));
	connect(okButton, SIGNAL(clicked()), messageDialog, SLOT(close()));
 
	QHBoxLayout *hbox2 = new QHBoxLayout;
	hbox2->addWidget(okButton);
	vbox->addLayout(hbox2);
 
	messageDialog->setLayout(vbox);
 
	messageDialog->show();
 
....
 
	int *j = (int *)calloc(10, sizeof(int));
	int *p = (int *)calloc(10, sizeof(int));
 
.....
 
	textEdit->append("AAAAAAAAAAA");
 
....
 
	free(p);
	free(j);
 
//	delete hbox2;
//	delete okButton;
//	delete hbox1 ;
//	delete textEdit;
//	delete vbox;
//	delete messageDialog;
 
}