Deleting and recreating QApplication crashes

int main(int argc, char * argv [])
{
	QApplication * app = new QApplication(argc, argv);
	QTextEdit textEdit;
	textEdit.show();
	app->exec();
	delete app;
	app = new QApplication(argc, argv);
	QWidget widget;
	widget.show();
	app->exec();
	delete app;
}