// header 11-1

#ifndef VECTOR0_H_
#define VECTOR0_H_
#include <iostream>

namespace VECTOR
{
    class vector
    {
    public:
        enum Mode{RECT, POL};
    private:
        double x;
        double y;
        double len;
        double ang;
        Mode mode;
        void set_len();
        void set_ang();
        void set_x();
        void set_y();
    public:
        vector();
        vector(double n1, double n2, Mode form = RECT);
        void reset(double n1, double n2, Mode form = RECT);
        ~vector();
        double xval() const { return x; }
        double yval() const { return y; }
        double lenval() const { return len; }
        double angval() const { return ang; }
        void polar_mode();
        void rect_mode();
        vector operator+(const vector & b) const;
        vector operator-(const vector & b) const;
        vector operator-() const;
        vector operator*(double n) const;
        friend vector operator*(double n, const vector & a);
        friend std::ostream & operator<<(std::ostream & os, const vector & v);
    };
}
#endif