circle_inher.cpp

it is a usefull thing

//=====================================
// circle_inher.cpp
//=====================================
#include"point.h"
#include"circle_inher.h"
//-------------------------------------
Circle::Circle(const Point& p, double r):Point(p),radius(r){}
double Circle::getRadius()const{ return radius; }
Point Circle::getPoint()const{return *static_cast<const Point*>(this);}
double Circle::getArea()const{ return radius * radius * Point::PI; }
double Circle::getCircum()const{ return 2 * radius * Point::PI; }
void Circle::moveTo(double a, double b){ x = a, y = b; }
void Circle::modifyRadius(double r){ radius = r; }