20160413-pointers-to-ints.c

#include <bits/wordsize.h>
#include <stdio.h>
#include <inttypes.h>

int main(void)
{
  uint64_t f, b, q, *foo, *bar, *qux;
  foo=&f, bar=&b, qux=&q;

  printf("size of a pointer is %d bytes\n",__WORDSIZE/8);
  printf("size of an `int` is  %d bytes\n",sizeof(f));

  *qux = (uint64_t) foo;
  *bar = (uint64_t) qux;
  *foo = (uint64_t) bar;

  printf("qux = %"PRIu64"\n",qux);
  printf("foo = %"PRIu64"\n",foo);
  printf("bar = %"PRIu64"\n",bar);
  printf("\n");

  printf("*qux = %"PRIu64"\n",*qux);
  printf("*foo = %"PRIu64"\n",*foo);
  printf("*bar = %"PRIu64"\n",*bar);
  printf("\n");

  printf("&qux = %"PRIu64"\n",&qux);
  printf("&foo = %"PRIu64"\n",&foo);
  printf("&bar = %"PRIu64"\n",&bar);
  printf("\n");

  printf("&qux == &foo → %d\n", &qux==&foo);
  printf("*foo == &qux → %d\n" , (*foo == &qux) );
  printf("*bar == *qux → %d\n" , (*bar == *qux) );
  printf("\n");

  return 0;
}

please assume 64 bit arch