Method setLength

Examples/NoModules/Chapter 20/Ex20_08/Box.h:17–17

  double getHeight() const { return m_height; }

  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; }