The array will be initialized to 0 if we provide the empty initializer list or just specify 0 in the initializer list.
int arr[5] = {}; // results in [0, 0, 0, 0, 0]
int arr[5] = { 0 }; // results in [0, 0, 0, 0, 0]

#include <string>
#include <iterator>
#include <iostream>
#include <algorithm>
#include <array>
 
int main()
{ // construction uses aggregate initialization std::array<int, 3> a1{ {1, 2, 3} }; // double-braces required in C++11 prior to // the CWG 1270 revision (not needed in C++11 // after the revision and in C++14 and beyond)
  std::array<int, 3> a2 = {1, 2, 3}; // double braces never required after =
  std::array<std::string, 2> a3 = { std::string("a"), "b" };
  // container operations are supported std::sort(a1.begin(), a1.end()); std::reverse_copy(a2.begin(), a2.end(), std::ostream_iterator<int>(std::cout, " "));
  std::cout << '\n';
  // ranged for loop is supported for(const auto& s: a3) std::cout << s << ' ';
  // deduction guide for array creation (since C++17) [[maybe_unused]] std::array a4{3.0, 1.0, 4.0}; // -> std::array<double, 3>
}

my @array = ();