C - Predefined Macros

Question 1

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Answer 1

__LINE__ - Contains the current line number of the program during compilation

Question 2

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Answer 2

__FILE__ - Contains the current file name

Question 3

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Answer 3

__DATE__ - Contains the date at which the source code of a program is converted to object code

Question 4

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Answer 4

__TIME__ - Gives the time at which a program is compiled in hours:minutes:seconds

Question 5

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Answer 5

__STDC__ - Used to confirm the compiler standard. Generally holds the value 1, meaning that the compiler conforms to ISO Standard C.

Question 6

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Answer 6

__STDC_HOSTED__ - Holds the value 1 if the compiler’s target is a hosted environment, a facility in which a third-party holds the compilation data and runs the programs on its own computers. Generally, the value is set to 1.

Question 7

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Answer 7

__STDC_VERSION__ - This macro holds the C Standard’s version number in the form yyyymmL where yyyy and mm are the year and month of the Standard version. This signifies which version of the C Standard the compiler conforms to.

Question 8

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Answer 8

__cplusplus - Is defined when the C++ compiler is used. It is used to test whether a header is compiled by a C or C++ compiler.

Question 9

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Answer 9

__OBJC__ - Is defined when the Objective C compiler is used. It is used to test whether a header is compiled by a C or Objective C compiler.

Question 10

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Answer 10

__ASSEMBLER__ - Is defined with value 1 when preprocessing assembly language.

Question 11

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Answer 11

__func__ / __FUNCTION__ - Contains the name of the function that it is used in.