How can I visualise how many processes this code creates?

Question

How many processes does this piece of code create?

for(int i = 0 ; i < 5 ; i++){
    if(fork() == fork())
    break;
}

Answer 1

The first parent spawns five children. Each of those spawns four children. Each of those spawns three children, and so on.

So it's:

5 * (1 + 4 * (1 + 3 * (1 + 2 * (1 + 1))))

Looks like 325 processes spawned, plus the original one.