[ryao]

Pointers are numbers representing memory addresses. This is very obvious if you look at the definition of NULL in C. It is:

  #define NULL ((void *)0)

As of C99, C also has uintptr_t, which lets you treat pointers as integers.

[moomin]

I mean, that’s horribly misleading. There’s no guarantee that “zero” is actually an int zero. (Although I’m pretty sure it is on Intel and ARM.)