Listing 3. First Push Button Code

void demo_1::on_pushButton_clicked()
{ //--- comment out or remove whatever is not needed.
        ui.pushButton->setText("New Name") ;
        ui.pushButton->setFont(QFont("Courier",10,QFont::Bold));
        QPalette palette;
        palette.setColor(ui.pushButton->backgroundRole(), Qt::red);
        palette.setColor(ui.pushButton->foregroundRole(),Qt::blue);
        ui.pushButton->setPalette(palette);
}