Connect standard c++ application with Qt

For a project at school, we have to develop a C++ application with a QT GUI interface. The "text mode" application is completed and works fine and so is the GUI. My problem is that I don't know where to start when it comes to integrating the two together, that is, the standard C++ classes with my Qt GUI.

For example, how are the attributes from the standard classes going to connect to the GUI? How are they gonna "communicate"? I have browsed the Internet to find some examples, but no luck so far.

Could anyone give me some pointers as to the general ideas between such an integration? Or maybe a link toward some tutorial that I have missed?

Thank you very much!
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