Writing our first Qt GUI application

Our first console application is really cool, isn't it? Let's continue exploring further. This time, let's write a simple GUI-based Hello World program. The procedure will remain almost the same, except for some minor changes in main.cpp. Refer to the following for the complete code:

Figure 5.7

Wait a minute. Let me explain the need for QApplication in line number 23 and line number 29. Every Qt GUI application must have exactly one instance of the QApplication instance. QApplication provides support for command-line switches for our application, hence the need to supply the argument count (argc) and the ...

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