ball399.h

Data Abstraction & Problem Solving with C++源码

#include "Sphere399.h"
#include <string>
using namespace std;
 
class Ball: public Sphere
{
public:
  // everything as before, except
  // displayStatistics is omitted
  // and getArea is virtual:

// constructors:
   Ball();
   Ball(double initialRadius,
        const string initialName);
   // Creates a ball with radius initialRadius and
   // name initialName.

// additional or revised operations:
   void getName(string currentName) const;
   // Determines the name of a ball.

   void setName(const string newName);
   // Sets (alters) the name of an existing ball.

   void resetBall(double newRadius,
                  const string newName);
   // Sets (alters) the radius and name of an existing
   // ball to newRadius and newName, respectively.

   virtual double getArea() const; // cross-sectional area

private:
   string theName; // the ball's name
}; // end class