In this section, we will put together a very simple hello world program. The program will show a simple button within a window. Create a file called hello.cpp in a newly created folder called hello_world. Open the file and insert the code:
#include <QApplication>#include <QLabel>int main(int argc, char *argv[]){ QApplication app(argc, argv); QLabel label("Hello world !"); label.show(); return app.exec();}
This looks like a regular C++ program, with the exception of unfamiliar classes being used.
Like any regular program, the int main() function is the entry point of our application.
An instance of the QApplication class is created, called app, and the arguments passed to the main() function. The app object is required because ...
