cppDynArrResizeBasic

#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++;
    }
}



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

    // add new element to array tail
    //int* newArr{ createArr(arr1Size + 1) };
    int* newArr{ new int[arr1Size + 1]{} };

    // copy old array content to new array
    for (int i{ 0 }; i < arr1Size; ++i)
    {
        newArr[i] = arr1[i];
    }

    //deleteArr(arr1);
    delete[] arr1;
    arr1 = newArr;
    ++arr1Size;
    printArr(arr1, arr1 + arr1Size);

    // delete element from array tail
    newArr = new int[--arr1Size];
    for (int i{ 0 }; i < arr1Size; ++i)
    {
        newArr[i] = arr1[i];
    }
    delete[] arr1;
    arr1 = newArr;
    printArr(arr1, arr1 + arr1Size);

    deleteArr(arr1);
}