Discussion
Which of the following statement is true?
Answer: B
Correct answer: During Preprocessing the Code #include replaces by stdio.h
#include is a preprocessor directive, and the preprocessor runs before the compiler sees anything. It replaces the directive with the entire text of the named file, producing a single translation unit.
What is inserted is declarations, not code: the header tells the compiler the types and signatures of the library functions, while the functions themselves live in the library and are joined at link time. Confusing the two is what makes a missing library a puzzling error, since the header alone compiles perfectly well.
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