Can anyone explain how the increment and decrement operators works in an expression?

Question

For example
If n=1
then n++ + --n + n++ - n-- = ?

Answer 1

https://www.sololearn.com/discuss/489143/?ref=app

Answer 2

just remember a simple rule
if it is preincrement then first increment the value and then use it and if it is postincrement then first use it then increment it.