C++ Circular Inheritance and Class

Question

I'm getting the error "circular inheritance problem encountered in 'atan'" on the last line. I'm confused since it only occurs in that line and not in main(). I only include in the cpp file and not anywhere else. Since the error is only in the class function I guess I'm doing something wrong with the class, but can't figure out what it is.

*I only threw in the main as an example of when it works. Doesn't actually serve a purpose.

//.h file

#ifndef CIRCLE_H_
#define CIRCLE_H_


    class Circle {
    public:
        Circle(int minVertex=12);
        ~Circle();
    private:
        int pixels;
    };

#endif /* CIRCLE_H_ */

// cpp file

#include <circles.h>
#include <cmath>
using namespace std;

int main(){
    double pi = abs(9);
}


Circle::Circle(int minVertex = 12) {
    pixels = 1150;
    double pi = atan(0) *2; // problem here
}

Answer 1

class Circle: Circle 

您有一个从自身继承的类，那怎么办？

Answer 2

class Circle: Circle {

Are you trying to inherit Circle from Circle ?

Try simply

class Circle {