#include <algorithm>
#include <iterator>
#include <vector>
#include <iostream>

int main()
{
  typedef std::vector<double> Container;
  Container zahlen(3, 0.0);
  double arr[] = { 1, 2, 3, 4, 5 };

  std::copy(begin(arr), end(arr), std::back_inserter(zahlen));
  for(auto x : zahlen) 
    std::cout << x << ' ';
}