// protect against multiple #include
#ifndef MY3VECTOR_HEADER 
#define MY3VECTOR_HEADER

// myvec.h
//
#include <iostream>
//
// simple 3-vector class
//

class My3Vector 
{
private:        // coordinates, hidden
  double x;
  double y;
  double z;
public:  
  // The default constructor
  My3Vector(double xv = 0.0, double yv = 0.0, double zv = 0.0);

  // 1. method: get length of vector
  double Length() const;
  // 2. method: scalar product
  double Dot(const My3Vector & x) const;
  // 3. method: get angle between two vectors
  double Angle(const My3Vector & x) const;

  My3Vector operator + (const My3Vector & xv ) const;
  My3Vector operator * (const double & c ) const;
  friend std::ostream & operator << ( std::ostream &s, const My3Vector &x);
};

My3Vector operator * (const double & c, const My3Vector & v );

#endif