What is the behavior of the conversion specifier `p` with `NULL` pointer?

Question

I wonder if does:

void *ptr = NULL;
printf(\"%p\\n\", ptr);

Will always gives (nil) output?

Does it depend on standard

Answer 1

Will always gives (nil)?

Not at all. On my machine (Mac with i686-apple-darwin11-llvm-gcc-4.2) it prints 0x0.