How the result becomes as 8. If I execute this manually based on the operator precedence I suspect it should be 9. but I am wondering about the end result, which is 8. I hope, monks will have a better explanation.

Sorry for posting another "meta" reply, but... by any chance... are you doing (link @ GG) it again, jesuashok? Well, if not just don't take any offence, and the referenced links above may be of some interest to you.