Answer
This question is compilable and deterministic.
Its output is “0”.
Explanation
Since a has static storage duration and no initializer, it is guaranteed to be zero-initialized. Had a been defined as a local non-static variable insidemain(), this would not have happened.
Note: int a has static storage duration because it is declared at namespace scope. It does not need to have static in front of it, that would only denote internal linkage.
