Recursive pointers

c, pointers

Solution

When you have this line in code

    vp = &vp;

it's no surprise that `vp == &vp`...

In the first iteration, it is as you (and he) expect.

Problem

I was talking to someone who was new to low level languages, and manual memory management today and doing my best to explain pointers. He then came up with: ``` #include <stdio.h> int main() { int v = 0; void* vp = &v; int i = 0; for(; i < 10; ++i) { printf("vp: %p, &vp: %p\n", vp, &vp); vp = &vp; } } ``` The output of this is: ``` vp: 0xbfd29bf8, &vp: 0xbfd29bf4 vp: 0xbfd29bf4, &vp: 0xbfd29bf4 vp: 0xbfd29bf4, &vp: 0xbfd29bf4 vp: 0xbfd29bf4, &vp: 0xbfd29bf4 vp: 0xbfd29bf4, &vp: 0xbfd29bf4 vp: 0xbfd29bf4, &vp: 0xbfd29bf4 vp: 0xbfd29bf4, &vp: 0xbfd29bf4 vp: 0xbfd29bf4, &vp: 0xbfd29bf4 vp: 0xbfd29bf4, &vp: 0xbfd29bf4 vp: 0xbfd29bf4, &vp: 0xbfd29bf4 ``` Which makes no sense to him as vp should != &vp. I'm ashamed to say that I don't know what's going on here.. so, what's going on here?

Original source