Циклический обход массива

#include <iostream>
using namespace std;
template<typename Type>
int right(
    const Type* box,
    const size_t size,
    const size_t start,
    const size_t step
) {
    return box[(start + step) % size];
}
template<typename Type>
int left(
    const Type* box,
    const size_t size,
    const size_t start,
    size_t step
) {
    step %= size;
    return box[(size + start - step) % size];
}
int main() {
    int box[] = { 1, 2, 9, 5, 3, 6, 8 };
    const auto size = sizeof(box) / sizeof(box[0]);
    const auto index = 6U;
    const auto step = 10U;
    cout
        << right(box, size, index, step) << '\n'
        << left(box, size, index, step)
        << endl;
    system("pause");
}