How to solve this problem?

Question

Int a=5; int b; b= a++ + ++a; what is the value of b?

Answer 1

this is actually an undefined behavior, not even defined in the latest C++ standard, so it will depend on the implementation if and how it works

Answer 2

True. That's why it's best to write good code. Good code is more likely to be future proof, if weird hacks are avoided. It's an interesting question though.

Answer 3

It does the a+a first, then does the ++ twice:

i.e. a+a = 10, then the two increments are performed, giving the answer of 12:

Source:
http://www.cplusplus.com/forum/beginner/26383/

Code to demonstrate:
https://code.sololearn.com/c4tCJ8KvqIIj/#c