Hacker News Reader

Just to be an onerous bastard: As the code involves undefined behaviour, it's superfluous to reason about any output.

Only values of type void* are valid arguments in case of the %p conversion specifier as there need not be a uniform pointer representation.

Indeed, and if you use -Wall -Wextra -ansi -pedantic you get:

pointer-test.c:7:3: warning: format ‘%p’ expects type ‘void * ’, but argument 2 has type ‘int * ’

Same goes for using -std=c99 instead of -ansi, although casting to (void *) does get rid of the warning.