C programming questions :

1) Why do we not detach any of the enzyme threads? Would the program function if we detached the sleeper thread?

2) Threads are cancelled if the string contains a 'C' e.g. "Cherub". Why do we not include cancelled threads when adding up the total number of swaps?

4) What happens when a thread tries to join itself? (You may need to create a test program to try this) Does it deadlock? Or does it generate an error?

Thank you.