#include <iostream>

// Basic non‑type template parameter: size of an array.
// The size N is a compile‑time constant supplied as a template argument.

template<int N>
struct Arr {
    int data[N]{}; // array of N ints, default‑initialized to zero
};

int main() {
    Arr<5> a; // N = 5
    std::cout << "Arr size: " << sizeof(a) << " bytes" << std::endl;
    return 0;
}