Does pointer arithmetic have uses outside of arrays?

Question

I think I understand the semantics of pointer arithmetic fairly well, but I only ever see examples when dealing with arrays. Does it have any other uses that can\'t be achie

Answer 1

Pointer arithmetic by definition in C happens only on arrays. However, as every object has a representation consisting of an overlaid unsigned char [sizeof object] array, it's also valid to perform pointer arithmetic on this representation. For example:

struct foo {
    int a, b, c;
} bar;

/* Equivalent to: bar.c = 1; */
*(int *)((unsigned char *)&bar + offsetof(struct foo, c)) = 1;

Actually char * would work just as well.