Question

I’d /ike to know, how to pass pointers to dynamically allocated arrays using function arguments. This function is supposed to allocate array 10×10 (checks skipped for simplicity sake). Is this possible? What am i doing wrong? Thanks in advance.

int array_allocate2DArray ( int **array, unsigned int size_x, unsigned int size_y)
{
    array = malloc (size_x * sizeof(int *));

    for (int i = 0; i < size_x; i++)
        array[i] = malloc(size_y * sizeof(int));

    return 0;
}

int main()
{
    int **array;
    array_allocate2DArray (*&array, 10, 10);
}

Answer 1

Try something like this:

int array_allocate2DArray (int ***p, unsigned int size_x, unsigned int size_y)
{
    int **array = malloc (size_x * sizeof (int *));

    for (int i = 0; i < size_x; i++)
        array[i] = malloc(size_y * sizeof(int));

    *p = array;
    return 0;
}


int **array;
array_allocate2DArray (&array, 10, 10);

I used the temporary p to avoid confusion.