General :: Using Fork() To Create A Binary Tree?

I am working on a project where I need to use the C language to generate a tree of processes. I understand how fork() works but I cant seem to get fork() to create two children from one parent and then have the two children create two more children.

Right now what i am seeing is a chain...where the parent creates one child...and that child creates another ONE child..etc.

Here is what I have so far:

for (i=0; i<n;i++){
if (childpid = fork()) break;
}
if (childpid == -1){
perror ("

[Code]....