QSize size = desktopRect.size() * qreal(0.9); what does it mean?

[Amir Afendin]

Just watching some example here and kind of stacked on this line of code

QSize size = desktopRect.size() * qreal(0.9);

especially why do we need qreal(0.9) here? I know what qreal does but in this very situation i have no idea about purpose of this chunk of code.

[p3c0]

@Amir-Afendin I think to get 90% of desktopRect's size so that the widget size gets adjusted as per the desktop screen size?
0.9 = 90/100