A pointer example I used to show a mentee that pointers are pretty much just integers with memory addresses as values.

pointer-long-fun.c

#include <stdio.h>

int
main(void)
{
  long a = 1;
  long * b = &a;
  long c = (long) b;

  printf("c: %ld\n", c);
  printf("(* c): %ld\n", (* ((long *) c)));

  return 0;
}