How to solve the below question?

Question

Give all the possible display results obtained by running the below program?? Assume that the parent id Pid = 100;

/*
If you can explain how fork() works with + and *

*/
int main(){

int x;
x = ( fork() + fork() ) * fork() );
print("%d", x);

}

Answer 1

Im not an expert, but fork would create a copied unix process which executee from fork call (same happen for original parent process) return 0 to child process and process PID to parent process. In your case, i think, this happen at (fork() + fork()) * fork():

- at first fork call, A process (the main process) create a child process B

-at second fork call, either in A and B will forked other child 2 processes (C and D)

- at third fork call, other 4 processes will be forked from A, B, C and D (E,F,G,H)

at end you will have 8 processes (in practice 2^n where n is fork calls count). Anyway, about the x value, all depends on which process you want see... In main process (the original A) x will be (100+100)*100=20000 while in forked processes all depends by own PID and from parent process.
Anyway, im not sure, maybe someone more expert will help you better

Answer 2

Try Solve yourself

Answer 3

KrOW thank you for your reply

Answer 4

👍👍👍

Answer 5

I don't know how fork() works with the two operators "+" and "*"