#include "iostream"
using namespace std;
#define PI 3.141592653
class point
{
public:
point()
{
x=0;
y=0;
}
point(double x,double y)
{
this->x=x;
this->y=y;
}
double getX()
{
return x;
}
double getY()
{
return y;
}
private:
double x;
double y;
};
class circle:public point
{
public:
circle(double x=0,double y=0,double r=0):point(x,y),R(r)
{
}
void printPoint()
{
cout<<"Point:("< }
double getArea()
{
return PI*R*R;
}
double getLength()
{
return 2*PI*R;
}
private:
double R;
};
int main()
{
circle c(2,3,10);
c.printPoint();
cout<<"面积:"< cout<<"周长:"<}
