The suffix is Reading, for example, QRotationReading.
Q2
The class named QSensorGestureRecognizer.
Q3
It's the Qt Positioning module and you activate it by adding QT += positioning to the project fie.
Q4
One has to overload QDebug& operator<<()
Q5
It aborts the execution of the program if condition is false only if the program was built in the debug mode.
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