Method setHeight

Examples/NoModules/Chapter 12/Ex12_07/Box.h:21–21

  void setLength(double length) { if (length > 0) m_length = length; }
  void setWidth(double width)   { if (width > 0)  m_width  = width;  }
  void setHeight(double height) { if (height > 0) m_height = height; }

private:
  double m_length{1.0};