How is my answer wrong? (C++ Sololearn Challenge)

Question

Sololearn challenged me a C++ challenge so i accepted it.
Both I and sololearn got almost every question wrong. (sololearn won because of that one question i timed out on because i overthinked it)
But there are two questions that have a weird answer... no matter how much I think i can't think of a conclusion myself.
So how am i wrong?

First question with screenshot :
https://www.sololearn.com/post/1728447/?ref=app

Second question with screenshot :
https://www.sololearn.com/post/1728450/?ref=app

Answer 1

For the first question:
Both parameters got the reference of a, so a became 4 and the function returned 8.

For the second question:
Seems that member variables get initialised before the constructor body is executed.