#include <cstdio>
#include <sys/types.h>
#include <unistd.h>
using namespace std;

int main() {
    puts("initializing");
    int a = 5, *p = &a, pid;

    printf("dad pid: %d\n", getpid());
    pid = fork();
    if(!pid) {
        *p = 3;

    } else {
        sleep(1);
        printf("dad_a %d\n", a);
    }

    printf("a from %d: %d\n",getpid(), a);
    printf("reference %p", p);
}