// Vector3D.h
#ifndef __Vector3D
#define __Vector3D

class Vector3D
{
private:
	double x, y, z;

public:
	Vector3D(double x = 0, double y = 0, double z = 0)
	{
		this->x = x;
		this->y = y;
		this->z = z;
	}

	double getX() { return x; }
	void setX(double value) { x = value; }

	double getY() { return y; }
	void setY(double value) { y = value; }

	double getZ() { return z; }
	void setZ(double value) { z = value; }

	friend Vector3D operator+(const Vector3D &v1, const Vector3D &v2);

	Vector3D& operator+=(const Vector3D &v) {
		this->x += v.x;
		this->y += v.y;
		this->z += v.z;

		return *this;
	}
};

inline Vector3D operator+(const Vector3D &v1, const Vector3D &v2) {
	return Vector3D(v1.x + v2.x, v1.y + v2.y, v1.z + v2.z);
}

#endif // !__Vector3D

// Vector3D.cpp
#include <stdlib.h>
#include "Vector3D.h"

using namespace std;

int main() {
	Vector3D vec1(1, 2, 4);
	Vector3D vec2(3, 5, 7);

	Vector3D vec3 = vec1 + vec2;

	system("pause");
	return 0;
}