#include <iostream>

void vec_add(double a[3], double b[3], double out[3]) {
    for (int i = 0; i < 3; i++) out[i] = a[i] + b[i];
}

void vec_print(double v[3]) {
    std::cout << "(" << v[0] << ", " << v[1] << ", " << v[2] << ")\n";
}