> 
> **Possible Duplicate:**  
> 
> [Working of fork() in linux gcc](https://stackoverflow.com/questions/3513242/working-of-fork-in-linux-gcc) 
> 
> 
> 

```
#include <stdio.h>

void main ()
{
  printf ("ciao");
  fork ();
}

```

I have some ideas about C optimization but I'm not sure. Hope you know the answer.