circle.h

来自「谭浩强C程序设计习题答案」· C头文件 代码 · 共 15 行

//习题12.1中的circle.h文件
//CIRCLE.H
#include "point.h"
class Circle:public Point
{public:
  Circle(float x=0,float y=0,float r=0);
  void setRadius(float);
  float getRadius() const;
  float area () const;
  friend ostream &operator<<(ostream &,const Circle &);
 protected:
  float radius;
};