How many processes are forked here

Question

I know that it might come as a stupid question but could anyone help me understand the behavior of the following code snippet

//label 0
int main(){
  fork();         


        

Answer 1

The process tree looks like below. I used following naming convention for processes. prefix parent process name to the corresponding fork label that created it.

                [0]
          /      |      \
        [01]    [02]    [03]
       /  \       |
    [012] [013] [023]
     /
   [0123]

Like @Mat said, 8 processes are created.