QLabel *label = new QLabel("Hello world!"); label->setFixedHeight(50);
QPushButton *button = new QPushButton("Click me!"); button->setFixedHeight(30);This code creates a QPushButton widget with the text "Click me!" and sets its height to 30 pixels. These examples demonstrate how to use the setFixedHeight function to set the height of different types of widgets. The package library used for these examples is Qt, which is a popular C++ framework for creating graphical user interfaces.