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#ifndef PARTICLE_HH_
#define PARTICLE_HH_
#include "point.hh"
#include "constants.hh"
#include <cmath>
#include <vector>
#include <string>
#include <iostream>
#include <fstream>
class Particle
Particle(std::string name, double mass, Point x0, Arrow v0);
std::string const& name() const;
void name(std::string const& newName);
double const& mass() const;
void mass(double const& newMass);
double const& energy() const;
void energy(double const& newEnergy);
Point const& position() const;
void position(Point const& newPosition);
Arrow const& velocity() const;
void velocity(Point const& newVelocity);
Arrow const& acceleration() const;
void acceleration(Point const& newAcceleration);
bool operator==(Particle const& rhs) const;
bool operator!=(Particle const& rhs) const;
void printHeader(std::ofstream& ofs) const;
void printData(double const& time, std::ofstream& ofs) const;
friend std::ostream& operator<<(std::ostream& os, Particle const& p);
friend std::istream& operator>>(std::istream& is, Particle& p);
std::string name_;
double mass_;
double energy_;
Point position_;
Arrow velocity_;
Arrow acceleration_;
typedef std::vector<Particle> Particles;
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