Let's create a simple calculator application, using Qt Designer and two forms: one form that takes the arguments for an arithmetic operation, and a second dialog form to present the results.
Bear in mind that we will be using these forms in the following sections of this chapter as well. We'll do this twice in this chapter, first to show how to do this using Qt Widgets, and second, by using Qt Quick. The example is contrived but will show you how to create multiple user interface forms in both environments, and will give you practice in working with signals and slots.
F1 is the keystroke you can use in Qt Creator to get help. As you write code in this and subsequent chapters, for any class or method you're curious about, select it and hit F1. You'll be taken to Qt's Help mode, with documentation about that class...