debug.cpp

#include <algorithm>
#include <iostream>

void swap(int* a, int* b)
{
    int c = *a;
    *a = *b;
    *b = c;
}

void reverse(int* v, unsigned int len)
{
    for (unsigned int i = 0; i < (len + 1) / 2; i++) {
        const int a = i;
        const int b = len - i;

        swap(v + a, v + b);
    }
}

int* createAndFillVector(unsigned int len)
{
    auto v = new int[len];
    for (unsigned int i = 0; i < len; i++) {
        v[i] = i;
    }
    return v;
}

int main()
{
    constexpr auto arraySize = 100;
    int* v = nullptr;
    // create and reverse the vector of LEN numbers
    v = createAndFillVector(arraySize);
    reverse(v, arraySize);

    // check if the revert worked:
    const bool isReversed = std::is_sorted(v, v + arraySize, std::greater {});
    std::cout << "Vector reversed successfully: " << std::boolalpha
              << isReversed << "\n";

    return isReversed ? 0 : 1;
}