#include<iostream>
#include<cmath>

#define pi 3.14

#define N 4

using namespace std;

class kolo {
    float R, x, y, s;

    public :
        kolo() {
        }

        kolo(float a, float b, float c) : x(a), y(b), R(c) {
            cout << "using a list initialization constructor" << endl;
        }

        kolo(const kolo &src) {
            x = src.x;
            y = src.y;
            R = src.R;

            cout << "using the copy constructor" << endl;
        }

        void set(string c) {
            cout << "Enter kolo " << c << ": ";
            cout<<"R = ";
            cin>>R;
            cout<<"X coordinate = ";
            cin>>x;
            cout<<"Y coordinate = ";
            cin>>y;
        }
        void show(string c) {
            cout << "Kolo " << c << ": ";
            cout<<"R = "<<R<<endl;
            cout<<"X coordinate = "<<x<<endl;
            cout<<"Y coordinate = "<<y<<endl;
            cout<<"S = "<<S()<<endl;
        }

        float S() {
            s = pi*R*R;
            return s;
        }

        void analis(float a) {
            S();
            if(s >= a) {
                cout<<"S = "<<s<<" > "<<a<<endl;
            }  else {
                cout << "Circle s < " << a << endl;
            }
        }

        friend kolo operator ++ ( kolo &a) {
            ++a.R;
            ++a.x;
            ++a.y;
            return a;
        }
        friend bool operator >= ( kolo &a,  kolo &b) {
            if(a.s >= b.s) {
                return true;
            } else {
                return false;
            }
        }
};

int main() {

    int i;
    float p;
    bool a;

    kolo c1;
    c1.set("c1");
    c1.show("c1");

    kolo c2(0,0,4);
    c2.show("c2");

    kolo c3 = c2;
    c3.show("c3");

    ++c2;
    c2.show("c2");

    kolo c4 = c2;
    c4.show("c4");

    cout<<"c4 >= c1"<<endl;
    a = c4 >= c1;
    cout<<boolalpha<<a<<endl;

    kolo x[N];

    for(i=0; i<N; i++) {
        x[i].set("x");
    }

    cout<<"Enter P :";
    cin>>p;

    for(i=0; i<N; i++) {
        x[i].analis(p);
    }
    return 0;
}