fork combined with redirection

From: Prakash Prabhu (prakash.prabhu_at_gmail.com)
Date: 01/25/05 

Date: 25 Jan 2005 03:14:35 -0800

Hi ,

I ran the following code with output redirected to a file . I got weird
results ( or is that the
expected output ) ?

#include<stdio.h>
int main()
{
printf("\n Hello ");
if ( fork() == 0 )
{
printf("\n World");
}
return 0;
}

$ gcc -o hello hello.c
$ ./hello > out
$ cat out
  Hello
  World
  Hello

Why is Hello being printed twice ?

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