#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>

int
main()
{
    void * brk = sbrk(0);
    extern char _end;

    printf(".bss ends at %p\n", &_end);
    printf("Heap ends at %p (run this multiple times!)\n", brk);
    printf("malloc(0) returns %p\n", malloc(0));

    return 0;
}