// circle.h 
#ifndef CIRCLE_H   // be sure file only included once per compilation
#define CIRCLE_H

//
// Define a class that can be used to get objects of type Circle.
// A class defines a data structure and the member functions
// that operate on the data strcuture.
// The name of the class becomes a type name.

class Circle  // the 'public' part should be first, the user interface
              // the 'private' part should be last, the safe data
{
  public:
    Circle(double X, double Y, double R);  // a constructor
    void Show();                           // a member function
    void Set(double R);                    // change the radius
    void Move(double X, double Y);         // move the circle
  private:
    double Xcenter;
    double Ycenter;
    double radius;
};

#endif  // CIRCLE_H      nothing should be added after this line