Разработать класс Circle

#define _USE_MATH_DEFINES
 
#include <iostream>
#include <cmath>
using namespace std;
 
struct Point
{
    double x;
    double y;
};
 
class CCircle
{
private:
    Point center;
    Point point;
 
public:
    CCircle(Point c, Point p)
    {
        center = c;
        point = p;
    }
 
    double Length()
    {
        return 2 * M_PI * Radius();
    }
 
    double Square()
    {
        return M_PI * Radius() * Radius();
    }
 
    double Diameter()
    {
        return 2 * Radius();
    }
 
    double Radius()
    {
        return sqrt((point.x - center.x)*(point.x - center.x) + (point.y - center.y)*(point.y - center.y));
    }
 
    friend ostream& operator<< (ostream& out, const CCircle &c);
};
ostream& operator<< (ostream& out, const CCircle &c)
{
    out << "Center: x = " << c.center.x << ", y = " << c.center.y << endl;
    out << "Point:  x = " << c.point.x << ", y = " << c.point.y << endl;
    return out;
}
 
int main()
{
    Point c = { 1,2 };
    Point p = { -1,3 };
    CCircle circle(c, p);
    cout << circle;
    cout << "Radius = " << circle.Radius() << endl;
    cout << "Diameter = " << circle.Diameter() << endl;
    cout << "Length = " << circle.Length() << endl;
    cout << "Square = " << circle.Square() << endl;
}