Modernes C++ programmieren

//#(compile) c++; compiler:g132; options:-O3 -std=c++23; libs:-
// https://godbolt.org/z/dxb98rWzo 
#include <iostream>                // cout
#include <vector>
using std::vector;

vector<int> createData(size_t sz) {
  return vector<int>(sz);          // sz x null
}
void fibonacci(vector<int> &data) {
  for(auto it = begin(data)+2; it != end(data); ++it) { // iterator it
    *it = *(it-1) + *(it-2);
  }
}

std::ostream& show(std::ostream &os, const vector<int> &data) {
  for(auto it=begin(data); it != end(data); ++it)      // const_iterator it
    std::cout << *it << " ";
  return os;
}

int main() {
  vector<int> data = createData(10);
  data[0] = 1;
  data[1] = 1;
  fibonacci(data);
  show(std::cout, data) << "\n";
}