cppDynArrCreateFillAddDeletePrint

#include <iostream>

int* createArr(int size)
{
    return new int[size];
}

void deleteArr(int* ptr)
{
    delete[] ptr;
}

void printArr(const int* begin, const int* const end)
{
    while (begin != end)
    {
        std::cout << *begin++ << ' ';
    }
    std::cout << '\n';
}

void fillArr(int* begin, const int* const end, int start, int stop)
{
    while (begin != end)
    {
        *begin++ = (rand() % (stop - start) + start);
    }
}


void fillArr(int* begin, const int* const end, int val)
{
    while (begin != end)
    {
        *begin++ = val;
    }
}

void fillArr(int* begin, const int* const end)
{
    int val{1};
    while (begin != end)
    {
        *begin++ = val++;
    }
}

void addElemArr(int*& arr, int& size, int idx, int newElem = 0)
{
    int* newArr{ new int[size + 1] };

    for (int i{ 0 }; i < size; ++i)
    {
        *(newArr + i + (i >= idx)) = *(arr + i);
    }

    *(newArr + idx) = newElem;

    ++size;
    delete[] arr;
    arr = newArr;
}

void addElemEndArr(int*& arr, int& size, int newElem = 0)
{
    addElemArr(arr, size, size, newElem);
}

void delElemArr(int*& arr, int& size, int idx)
{
    int* newArr{ new int[--size] };

    for (int i{ 0 }; i < size; ++i)
    {
        *(newArr + i ) = *(arr + i + (i >= idx));
    }

    delete[] arr;
    arr = newArr;
}

void delElemEndArr(int*& arr, int& size)
{
    delElemArr(arr, size, size);
}

int main()
{
    int arr1Size{ 10 };
    auto arr1{ createArr(arr1Size) };
    fillArr(arr1, arr1 + arr1Size);
    printArr(arr1, arr1 + arr1Size);

    addElemArr(arr1, arr1Size, 5, 33);
    printArr(arr1, arr1 + arr1Size);

    delElemArr(arr1, arr1Size, 5);
    printArr(arr1, arr1 + arr1Size);

    addElemEndArr(arr1, arr1Size, 42);
    printArr(arr1, arr1 + arr1Size);

    delElemEndArr(arr1, arr1Size);
    printArr(arr1, arr1 + arr1Size);

    deleteArr(arr1);
}