Is (--i == i++) an Undefined Behavior?

Question

this question is related to my previous problem. The answer I got was \"It is an Undefined behavior.\"

Please anyone explain:

• What is an undef

Answer 1

Yes, that expression is undefined behavior as well (in C and C++). See http://en.wikipedia.org/wiki/Sequence_point for some information on the rules; you can also search for "sequence point" more generally (that is the set of rules that your code violates).