Discussion
During preprocessing, the code #include gets replaced by the contents of the file stdio.h. Which is true?
Answer: B
Correct answer: Yes
The statement is correct: #include is handled by the preprocessor, which runs before compilation and replaces the directive with the entire contents of the named file.
The result is a single translation unit containing the program text and every header it pulled in. What the header supplies is declarations - types and function signatures - so that the compiler can check calls. The functions themselves live in the library and are joined at link time, which is a later and quite separate stage.
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