PV024pointerIntoFunc

#include <iostream>


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

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

void randomizeArr(int* arr, int arrSize, int minVal, int maxVal)
{
    for (int i{ 0 }; i < arrSize; ++i)
    {
        arr[i] = rand() % (maxVal - minVal) + minVal;
    }
}

void printArr(int* arr, int arrSize)
{
    for (int i{ 0 }; i < arrSize; ++i)
    {
        std::cout << arr[i] << ' ';
    }
    std::cout << '\n';
}

// arr = appendArr(arr, size, size1);
// arr = appendArr(arr, &size, &size1);
int* appendArr(int* arrOld, int* arrSize, int* newSize)
{
    int* tmp{ new int[*newSize]{} };

    for (int i{ 0 }; i < *arrSize; ++i)
    {
        tmp[i] = arrOld[i];
        //*(tmp + i) = *(arr + i);
    }

    delete[] arrOld;
    arrOld = tmp;
    *arrSize = *newSize;

    printArr(arrOld, *arrSize);
    return arrOld;
}

int main()
{
    int size;
    int size1;

    std::cout << "Enter array1 size\n";
    std::cin >> size;

    std::cout << "Enter array1 size1\n";
    std::cin >> size1;

    int* arr{ createArr(size) };
    randomizeArr(arr, size, 0, 10);
    printArr(arr, size);

    std::cout << "Resizing arr from " << size << " elements to " << size1 << " elements...\n";

    arr = appendArr(arr, &size, &size1);
    std::cout << "size = " << size << '\n';
    printArr(arr, size);

    deleteArr(arr);

    return 0;
}