dynamic allocation/deallocation of 2D & 3D arrays

Question

I know about algorithms to allocate/deallocate a 2D array dynamically, however I\'m not too sure about the same for 3D arrays.
Using this knowledge and a bit of symmetry

Answer 1

arr3d should be a triple pointer and not just an int. Otherwise looks OK:

void deallocate3D(int*** arr3D,int l,int m)
{
    int i,j;

    for(i=0;i

arr3D is a pointer-to-pointer-to-pointer, so arr3D[i] is a pointer-to-pointer and arr3D[i][j] just a pointer. It's correct to release the lowest dimension in a loop first, and then climb up the dimensions until arr3D itself is released.

Also it's more idiomatic to give malloc the sizeof of the pointed type implicitly. Instead of:

  arr3D[i] = (int**)malloc(m * sizeof(int*));

Make it:

  arr3D[i] = (int**)malloc(m * sizeof(*arr3D[i]));

And yes, such dynamically allocated multi-dimensional arrays can be accessed just as statically allocated multi-dimensional arrays.