PracticeDev/study_cpp/cpp_primer_source_code/Chapter 11/vect.h

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2022-12-20 17:31:11 +08:00
// vect.h -- Vector class with <<, mode state
#ifndef VECTOR_H_
#define VECTOR_H_
#include <iostream>
namespace VECTOR
{
class Vector
{
public:
enum Mode {RECT, POL};
// RECT for rectangular, POL for Polar modes
private:
double x; // horizontal value
double y; // vertical value
double mag; // length of vector
double ang; // direction of vector in degrees
Mode mode; // RECT or POL
// private methods for setting values
void set_mag();
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;} // report x value
double yval() const {return y;} // report y value
double magval() const {return mag;} // report magnitude
double angval() const {return ang;} // report angle
void polar_mode(); // set mode to POL
void rect_mode(); // set mode to RECT
// operator overloading
Vector operator+(const Vector & b) const;
Vector operator-(const Vector & b) const;
Vector operator-() const;
Vector operator*(double n) const;
// friends
friend Vector operator*(double n, const Vector & a);
friend std::ostream & operator<<(std::ostream & os, const Vector & v);
};
} // end namespace VECTOR
#endif