Discussion
What is #include directive?
Answer: A
Correct answer: Tells the preprocessor to grab the text of a file and place it directly into the current file
#include performs a textual insertion: the named file’s contents replace the directive, and the result is then processed as if it had been typed there. This is why a header can define macros and types that the including file goes on to use, and why include guards are needed to stop the same text arriving twice.
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