fork problems

I have written the following.

Code:

---

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

int main(void) {
        int i, pid;
        pid = fork();
        if(pid == 0)
        {
                int j;
                for(j=0; j < 10; j++)
                {
                        printf("child: %d\n", j);
                        fflush(stdout);
                }
                exit(0); /* Note that we do not use exit() */
        }
        else if(pid > 0)
        {
                int i;
                for(i=0; i < 10; i++)
                {
                        printf("parent: %d\n", i);
                        fflush(stdout);
                }
        }
        else
        { 
                fprintf(stderr, "couldn't fork");
                return;
        }
}

---

When i run it, it prints 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9.
My question is, shouldn't it print them mixed up?
Shouldn't the parent and child process run in parallel instead of sequentially?

> Shouldn't the parent and child process run in parallel instead of sequentially?
Over the long term, they will.

But over such a short piece of code which takes a lot less than a single kernel tick, each process will get all it's work done in one kernel time slice.