Variable Sized Arrays vs calloc in C

Question

On the discussion of dynamic memory here: \"Intro to C Pointers and Dynamic Memory\"

The author states:

A memory block like this can effective

Answer 1

I agree with ocdecio that c89 doesn't allow

int array[variable]

c99 allows some types of variables and expressions to be the array size. But in addition to that, things allocated with malloc and family can be resized using realloc.