write(), printf(), and function references in C -

a few questions simple scenario:

#include <unistd.h> #include <stdio.h>  void empty(){};  int main() {     printf("%p\t%lu\n", empty, sizeof(empty));     write(1, empty, 100);      return 0; } 

what happening when use function's name reference?

it shows size of 1 printf still treats pointer , yet void pointer of size 8. additionally, onto write function:

essentially want replicate printf %p writing value of memory address rather value @ address better handle on how works :^)

thanks!