C언어 - 키워드와 예약어

en.cppreference.com/w/c/keyword

C keywords - cppreference.com

C keywords

 

Keywords

 

This is a list of reserved keywords in C. Since they are used by the language, these keywords are not available for re-definition.

auto break case char const continue default do double else enum extern

float for goto if inline (since C99) int long register restrict (since C99) return short

signed sizeof static struct switch typedef union unsigned void volatile while

_Alignas (since C11) _Alignof (since C11) _Atomic (since C11) _Bool (since C99) _Complex (since C99) _Generic (since C11) _Imaginary (since C99) _Noreturn (since C11) _Static_assert (since C11) _Thread_local (since C11)

 

 

 

 

 

 

 

 

 

The most common keywords that begin with an underscore are generally used through their convenience macros:

keyword	used as	defined in
_Alignas (since C11)	alignas	stdalign.h
_Alignof (since C11)	alignof	stdalign.h
_Atomic (since C11)	atomic_bool, atomic_int, ...	stdatomic.h
_Bool (since C99)	bool	stdbool.h
_Complex (since C99)	complex	complex.h
_Generic (since C11)	(no macro)
_Imaginary (since C99)	imaginary	complex.h
_Noreturn (since C11)	noreturn	stdnoreturn.h
_Static_assert (since C11)	static_assert	assert.h
_Thread_local (since C11)	thread_local	threads.h

header를 include할때부터 사용할수 없다.

 

 

 

pinrtf를 변수선언 해버릴 경우 컴파일때 함수로 인식하지 않고 변수로 인식해서 에러가 난다.

 

 

 

 

 

if elif else endif defined

ifdef ifndef define undef

include line error pragma

전처리기에서 쓰는 것들

 

_Pragma(since C99)