Discussion
There exists a way to prevent the same file from getting #included twice in the same program.
Answer: A
Correct answer: True
That is what an include guard does. The header wraps its contents in #ifndef HDR_H / #define HDR_H / #endif, so on any later inclusion the macro is already defined and the body is skipped. #pragma once achieves the same thing in one line, though it is a compiler extension rather than standard C.
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