Вывести элементы массива в обратном порядке

#include <iostream>
#include <utility>
 
 
template<typename T, std::size_t N, std::size_t ... Indexes>
void out_reverse_array_impl(T (&arr)[N], std::index_sequence<Indexes...>)
{
    ((std::cout << arr[N - Indexes - 1] << " "), ...) << "\n";//C++17 needed
}
 
 
 
template<typename T, std::size_t N>
void out_reverse_array(T (&arr)[N])
{
    out_reverse_array_impl(arr, std::make_index_sequence<N>());
}
 
 
 
int main()
{
    int arr[] = {10, 20, 30, 40, 50};
    out_reverse_array(arr);
}

#include <iostream>
#include <algorithm>
#include <iterator>
 
 
 
int main()
{
    int arr[] = {10, 20, 30, 40, 50};
    std::reverse_copy(std::begin(arr), std::end(arr), std::ostream_iterator<int>(std::cout, " "));
}

#include <iostream>
#include <vector>
 
#include <boost/range/adaptor/reversed.hpp>
#include <boost/range/algorithm/for_each.hpp>
 
int main()
{
  using boost::adaptors::reversed;
  using boost::range::for_each;
 
  std::vector<double> xs = {0.1, 0.2, 0.3, 0.4, 0.5};
 
  for_each(xs | reversed, [](double x) { std::cout << x << " "; });
  std::cout << std::endl;
 
  return 0;
}

#include <iostream>
#include <ctime>
using namespace std;
 
int main()
{
    srand((int)time(0));
    int N;
    cout <<"Enter N: "; cin >>N;
 
    double*a = new double[N];
 
    for (int i = 0; i < N; i++)
      {
      a[i]=rand()%9 + 1;
      cout <<a[i]<<" ";
      }
    cout <<endl;
    
    for (int i = N-1; i >=0; i--)
    cout <<a[i]<<" ";
    
    delete[]a;
system("pause");
return 0;
}

#include <iostream>
using namespace std;
 
 
int main()
{
    int N[] = { 1,2,3,4,5,6,6,6,7 };
    for (int i = sizeof N / sizeof N[0] - 1; i >= 0; i--)
    {
        cout << N[i] << endl;
    }
 
 
    system("pause");
    return 0;
}

#include <iostream>
 
int main()
{
  int a[5] = {10,20,30,40,50};
  for(int i = sizeof(a) / sizeof(a[0]); i;) {
    std::cout << a[--i] << " ";
  }
}