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- A
#ifdef MY_LIBRARY_H
#define MY_LIBRARY_H
// my_library.h content
#endif /* MY_LIBRARY_H */ - B
#ifndef MY_LIBRARY_H
#define MY_LIBRARY_H
// my_library.h content
#endif /* MY_LIBRARY_H */ - C
#ifdef MY_LIBRARY_H
#undef MY_LIBRARY_H
// my_library.h content
#endif /* MY_LIBRARY_H */ - D
#define MY_LIBRARY_H
#include MY_LIBRARY_H
// my_library.h content
#undef MY_LIBRARY_H
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