C Preprocessor Question: Download C Preprocessor PDF

1. Which of the following are C preprocessors?
a) #ifdef
b) #define
c) #endif
d) All of the mentioned

d
(All of the mentioned)

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Do you have any idea about the use of "auto" keyword?	#include statement must be written a) Before main() b) Before any scanf/printf c) After main() d) It can be written anywhere