Discussion
Which of the following is true of external variables?
Answer: D
Correct answer: All of the above
All three statements describe external variables. Because any function can read and write them, they provide a channel of communication in both directions between functions without passing arguments or returning values.
Their scope runs from the point of definition to the end of the translation unit, and beyond it in files that declare them extern. Having static storage duration, they are zero-initialised if no initialiser is given. The convenience is real but so is the cost: shared mutable state is the hardest kind of code to reason about.
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