что нужно написать чтобы вывести v3 на экран
#include

using namespace std;
struct Vector3
{
int x, y, z;
Vector3()
{}

Vector3(int x, int y, int z): x(x), y(y), z(z)
{}
Vector3 operator + (Vector3 v1)
{
return Vector3(this->x+v1.x,this->y+v1.y,this->z+v1.z);
}
};
int main()
{
Vector3 v1(1, 2, 3);
Vector3 v2(4, 5 ,6);
Vector3 v3;

v3 = v1 + v2;
}

#include <iostream>#include <sstream>using namespace std;struct Vector3{int x, y, z;Vector3(){}Vector3(int x, int y, int z): x(x), y(y), z(z){}Vector3 operator + (Vector3 v1){return Vector3(this->x+v1.x,this->y+v1.y,this->z+v1.z);}std::string ToString(){ std::stringstream s; s <<"(" << this->x << "," << this->y <<"," << this->z << ")"; return s.str();}};int main(){Vector3 v1(1, 2, 3);Vector3 v2(4, 5 ,6);Vector3 v3;v3 = v1 + v2;cout << v3.ToString();}