I need help for this code.

Question

Can any one help to figure the answer I'm not getting it.
https://code.sololearn.com/c64upt3TYA6x/?ref=app

Answer 1

You can work out well-defined steps all the way till line 9. Line 10 on the other hand, consist of multiple prefix/postfix operators used between two sequence points, which will result in undefined behaviour.

https://stackoverflow.com/questions/4176328/undefined-behavior-and-sequence-points