arrResizeDynMemPointers

#include<iostream>

void printArr(int* ptr, int size)
{
    for (auto elP{ ptr }; elP != (ptr + size); ++elP)
    {
        std::cout << *elP << ' ';
    }
    std::cout << '\n';
}

void copyArr(int* arr1, int* arr2, int arr2Size)
{
    for (auto elP{ arr2 }; elP != (arr2 + arr2Size); *arr1++ = *elP++);
}

int main()
{
    int* ptr{ nullptr };
    int size{ 5 };
    ptr = new int[size]{ 1,2,3,4,5 };
    printArr(ptr, size);

    size = 10;
    int* tmp = new int[size]{};
    copyArr(tmp, ptr, 5);
    delete[] ptr;
    ptr = tmp;
    printArr(ptr, size);

    size = 4;
    tmp = new int[size] {};
    copyArr(tmp, ptr, 4);
    delete[] ptr;
    ptr = tmp;
    printArr(ptr, size);

    delete[] ptr;
}