Опишите класс кругов Circle на С++

#include <iostream>
 
class Circle
{
    friend bool operator==(const Circle& lhs, const Circle& rhs);
    friend bool operator!=(const Circle& lhs, const Circle& rhs);
    friend bool operator<(const Circle& lhs, const Circle& rhs);
    friend bool operator>(const Circle& lhs, const Circle& rhs);
 
public:
    Circle() : Circle(0.0, 0.0, 1.0) {}
    Circle(double ix, double iy, double iradius) :
        x(ix), y(iy), radius(iradius) {}
    void info();
private:
    double x;
    double y;
    double radius;
};
 
void Circle::info()
{
    std::cout << "Center: " << x << ", " << y << std::endl;
    std::cout << "Radius: " << radius << std::endl;
}
 
bool operator==(const Circle& lhs, const Circle& rhs)
{
    return lhs.radius == rhs.radius;
}
 
bool operator!=(const Circle& lhs, const Circle& rhs)
{
    return !(lhs == rhs);
}
 
bool operator<(const Circle& lhs, const Circle& rhs)
{
    return lhs.radius < rhs.radius;
}
 
bool operator>(const Circle& lhs, const Circle& rhs)
{
    return rhs < lhs;
}
 
int main()
{
    Circle c1, c2(5.0, 2.0, 3.0);
 
    c1.info();
    c2.info();
 
    if(c1 < c2)
    {
        std::cout << "c1 < c2\n";
    }else if(c1 == c2)
    {
        std::cout << "c1 = c2\n";
    }else
    {
        std::cout << "c1 > c2\n";
    }
 
    return 0;
}

#include <cmath>
 
bool operator==(const Circle& lhs, const Circle& rhs)
{
    return abs(lhs.radius - rhs.radius) < 0.0001;
}