c08p405.txt

来自「Data Abstraction & Problem Solving with 」· 文本 代码 · 共 10 行

class EquidistantShape  // abstract base class
{
public:
   void setRadius(double newRadius);
   double getRadius() const;
   virtual void displayStatistics() const = 0;

private:
   double theRadius;
};  // end class