F.S. untested

//Create a class Cylinder. It should have the following members:
//Two private members: length, radius.
//A default constructor without parameters.
//A parametrized constructor, with two parameters, to set the corresponding value of the private members (make use of the this pointer //upon initialization of the members).
//A public double volume() function which calculates the volume of the cylinder. (volume = pi * radius^2 * length)
//A public double surface() function which calculates the surface area of the cylinder. (surface = 2 * pi * radius * length)
//In the main() function, create an array of Cylinder objects. Input the number of cylinders from the keyboard and enter their //parameters.
//Output the volumes and surface areas of all cylinders.
//Output the cylinders with the smallest volume and surface areas and their location in memory.
#include<iostream>
using namespace std;
class Cylinder {
private:
    double length, radius;
public:
    Cylinder() {
        this->length = 0.0;
        this->radius = 0.0;
    }
    Cylinder(double length, double radius) {
        this->length = length;
        this->radius = radius;
    }
    Cylinder(const Cylinder &copy) {
        this->length = copy.length;
        this->radius = copy.radius;
    }
    Cylinder &operator=(const Cylinder &copy) {
        if(this!=&copy) {
            this->length = copy.length;
            this->radius = copy.radius;
    }
    return *this;
    }
    double volume() {
        double volumee = 3.1415 * this->radius*2 * this->length;
        return volumee;
    }
    double surface() {
        double surfacee = 2 * 3.1415 * this->radius * this->length;
        return surfacee;
    }
};
int main() {
    int n;
    cout<<"Please enter the number of cylinders"<<endl;
    cin>>n;
    Cylinder * cil[100];
    double a, b;
    int indeks1 = 0;
    int indeks2 = 0;
    double cmpvolume = cil[0]->volume();
    double cmpsurface = cil[0]->surface();
    for(int i=0; i<n; i++)    {
        cout<<"Please enter the length and radius for cylinder "<<i+1<<" respectively."<<endl;
        cin>>a>>b;
        cil[i] = new Cylinder(a, b);
        if(cil[i]->volume() < cmpvolume) {
            cmpvolume = cil[i]->volume();
            indeks1 = i;
        }
        if(cil[i]->surface() < cmpsurface) {
            cmpsurface = cil[i]->surface();
            indeks2 = i;
        }
        cout<<"Volume is "<<cil[i]->volume();
        cout<<"Surface is "<<cil[i]->surface();
    }
    cout<<"Smallest volume is "<<cil[indeks1]->volume()<<". Location is "<<&cil[indeks1];
    cout<<"Smallest surface is "<<cil[indeks2]->surface()<<". Location is "<<&cil[indeks2];
}