English
- //习题12.1中的circle.cpp文件
- //CIRCLE.CPP
- //#include <iostream.h>
- Circle::Circle(float a,float b,float r):Point(a,b),radius(r){}
- void Circle::setRadius(float r)
- {radius=r;}
- float Circle::getRadius() const {return radius;}
- float Circle::area() const
- {return 3.14159*radius*radius;}
- ostream &operator<<(ostream &output,const Circle &c)
- {output<<"Center=["<<c.x<<","<<c.y<<"], r="<<c.radius<<", area="<<c.area()<<endl;
- return output;
- }
