Mathematical problem with a template

[AlionSolutions]

Hi,
I have this template

template <class T> class dimensions
{
  protected:
    T m_xstart;
    T m_xend;
    T m_ystart;
    T m_yend;

  public:
   inline T getxstart(){return m_xstart;}
   inline T getxend(){return m_xend;}
   inline T getystart(){return m_ystart;}
   inline T getyend(){return m_yend;}

   inline void setxstart(T xstart){m_xstart = xstart;}
   inline void setxend(T xend){m_xend = xend;}
   inline void setystart(T ystart){m_ystart = ystart;}
   inline void setyend(T yend){m_yend = yend;}

   inline double getaspectratio()
   {
     T width = m_xend - m_xstart;
     T height = m_yend - m_ystart;

     if (height)
       return width / height;}
};

Now if I do the following:

  dimensions<double> dim;
  dim.setxstart(0);
  dim.setxend(500);
  dim.setystart(0);
  dim.setyend(1000);

  double ratio = dim.getaspectratio();

"ratio" is allways zero. I expect it to be 0.5. Why is this?

Thanks in advance

Juergen