Thread: 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?