#include <iostream>
#include <cmath>

using namespace std;

class Circle {
private:
    static int count;
    int rad;
    double coordX, coordY;
public:
    Circle() {
        count++;
        this->coordX = 0;
        this->coordY = 0;
        this->rad = 1;
        cout << "Now it's an elementary circle with radius 1" << endl;
    }
    Circle(double coordX, double coordY, int r) {
        count++;
        this->coordX = coordX;
        this->coordY = coordY;
        this->rad = r;
        cout << "Now it's a circle with center in " << "(" << this->coordX << ", " << this->coordY << ") ";
        cout << "and with radius " << this->rad << endl;
    }
    Circle(const Circle& p) {
        count++;
        this->coordX = p.coordX;
        this->coordY = p.coordY;
        this->rad = p.rad;
    }

    friend istream& operator>>(istream& in, Circle c) {
        in >> c.coordX >> c.coordY >> c.rad;
        return in;
    }

    double circleLength() {
        double pi = acos(-1);
        cout << "The length of the " << count << " circle is " << 2 * pi * (this->rad) << endl;
        return 2 * pi * (this->rad);
    }

    double roundSquare() {
        double pi = acos(-1);
        cout << "The square of the " << count << " round is " << pi * pow((this->rad), 2) << endl;
        return pi * pow((this->rad), 2);
    }

    void printEquation() {
        cout << "The equation of this circle is ";
        cout << "(x - " << this->coordX << ")^2 + (y - " << this->coordY << ") = " << pow((this->rad), 2) << endl;
    }
};

int Circle::count = 0;
int main() {
    Circle c1;
    Circle c2(2, 3, 1);
    Circle c3 = c2;

    cout << "Write the information the first circle: ";
    cin >> c1;
    cout << "For c1: Circle length = " << c1.circleLength() << "; Round square = " << c1.roundSquare() << endl;
    c1.printEquation();

    cout << "For c2: Circle length = " << c2.circleLength() << "; Round square = " << c2.roundSquare() << endl;
    c2.printEquation();

    cout << "For c3: Circle length = " << c3.circleLength() << "; Round square = " << c3.roundSquare() << endl;
    c3.printEquation();

    return 0;
}