C to JavaScript

I know a good few hardcore C peeps lurk around here, is this possible?

 (*p)++

>>3
>the allocation unit

This is something that scared me about my computer architecture class. The prof showed iterating through an array int a[] by using (*a)++ as shown. What is the pointer a defined as? Multiples of 4 bytes? (For a 32-bit system, obviously.) Does that mean (char*)a would have to multiply the value by 4?