C++ default Constructor not being called [duplicate]

Question

I am very new to c++ so forgive me if I have overlooked something simple. I have a class Circle:

class Circle: public Shape{
protected:
     //string name;
     Point focus;
     float radius;
private:

public:
    virtual void calculateArea();
    virtual void calculatePerimeter();
    Circle();
    Circle(Point p, float r);

};

I have two constructors, one of which is the default which I have overloaded:

Circle::Circle()
{
    Point p(1,1);
    focus = p;
    radius = 10;
    name = "Circle";
    calculatePerimeter();
    calculateArea();
    cout<<"default circle"<<endl;
}
Circle::Circle(Point p, float r)
{
    focus = p;
    radius = r;
    name = "Circle";
    calculatePerimeter();
    calculateArea();
}

In my main I try to create two circles one using the each constructor, however the Circle being created with Circle() never gets created. I cannot for the life of me figure out why? There are no error messages or anything.

int main{
    Circle circle(a, 3.3);
    Circle c2();
}

Answer 1

 Circle c2();

Does not create an object, it declares a function by name c2 which takes no argument and returns a Circle object. If you want to create a object just use:

Circle c2;

Answer 2

This here is not an instantiation, but a function declaration:

// parameter-less function c2, returns a Circle.
Circle c2();

You need

Circle c2;

or

Circle c2{};  // requires c++11