/** @file list3303.cpp */
/** Listing 33-3. The point Class Defined with the class Keyword */
class point
{
public:
  point() : r_(0.0), angle_(0.0) {}

  double x() const { return distance() * std::cos(angle()); }
  double y() const { return distance() * std::sin(angle()); }

  double angle()    const { return angle_; }
  double distance() const { return r_; }

  // ... other member functions omitted for brevity ...

private:
  double r_;
  double angle_;
};