#include <array>
#include <algorithm>
#include <iostream>
 
typedef std::array<float,3> Vector3D;
 
Vector3D operator + (const Vector3D& a, const Vector3D& b)
{
   Vector3D c;
   std::transform(a.begin(), a.end(), b.begin(), c.begin(), 
               [](float a, float b){return a + b;});
   return c;
}
 
std::ostream& operator << (std::ostream& os, const Vector3D& a)
{
   return os << a[0] << ',' << a[1] << ',' << a[2];
}
 
int main() {
   Vector3D a = {2, 3, 0};
   Vector3D b = {3, -3, 0};
   Vector3D c = a + b;
   std::cout << c << std::endl;
}

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