The QSize class defines the size of a two-dimensional object. ... int  width  () const . ... QSize&  operator+=  ( const QSize & )  . ... Constructs a size with width w and height h. Returns a size with the minimum width and height of this size and otherSize. Returns a size with the maximum width and height of this size and otherSize. ... Multiplies both the width and height with c and returns a reference to the size. ... Divides both the width and height by c and returns a reference to the size. ...