#include "ui_mainwindow.h"

[LeandroA]

Hi,
I'm getting familiar with the Qt "hello world".

I do not understand the line #include "ui_mainwindow.h".
If the file ui_mainwindow.h does not exist how can it be included?

[SGaist]

Hi and welcome to devnet,

That's a generated file which source is the .ui file created for designer.

More information here

[Walux]

Please mark the topic as solved if it's the case of course ;)

[LeandroA]

Thank you for the explanation!.