#include<iostream>
using namespace std;

void add_vectors(const double *a, const double *b, double *result){
	result[0] = a[0] + b[0];
	result[1] = a[1] + b[1];
}

int main(){
	double first_vector[2] = {5.6, 3.4};
	double second_vector[2] = {-7.2, -1.3};

	double result_vector[2];
	add_vectors(first_vector, second_vector, result_vector);
	cout << "Result:  " << result_vector[0] << ", " << result_vector[1] << endl;

	cout << first_vector + second_vector << endl;

	return 0;
}