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    Type support

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    Type support
     

    Basic types

    Fundamental types defined by the language

    Additional basic types and convenience macros

    <stddef.h> 헤더에 정의됨.
    		sizeof 연산자로 반환된 부호없는 정수타입
    (typedef) [edit]
    		두 포인터를 뺀 경우에 부호있는 정수 타입을 반환한다.
    (typedef) [edit]
    		널 포인터 상수
    (macro constant) [edit]
    (C11)
    		 a type with alignment requirement as great as any other scalar type
    (typedef) [edit]
    		byte offset from the beginning of a struct type to specified member
    (function macro) [edit]
    <stdbool.h> 헤더에 정의됨.
    bool
    (C99)
    		 convenience macro, expands to _Bool
    (keyword macro)
    true
    (C99)
    		 expands to integer constant 1 (until C23)((_Bool)+1u) (since C23)
    (macro constant)
    false
    (C99)
    		 expands to integer constant 0 (until C23)((_Bool)+0u) (since C23)
    (macro constant)
    __bool_true_false_are_defined
    (C99)
    		 expands to integer constant 1
    (macro constant)
    <stdalign.h> 헤더에 정의됨.
    alignas
    (C11)
    		 convenience macro, expands to keyword _Alignas
    (keyword macro)
    alignof
    (C11)
    		 convenience macro, expands to keyword _Alignof
    (keyword macro)
    __alignas_is_defined
    (C11)
    		 expands to integer constant 1
    (macro constant)
    __alignof_is_defined
    (C11)
    		 expands to integer constant 1
    (macro constant)
    <stdnoreturn.h> 헤더에 정의됨.
    noreturn
    (C11)
    		 convenience macro, expands to _Noreturn
    (keyword macro)

    Fixed width integer types (since C99)

    Numeric limits

    Notes

    See More

    The type of true and false is int rather than _Bool.

    		(since C99)
    (until C23)

    A program may undefine and perhaps then redefine the macros bool, true and false. However, such ability is a deprecated feature.

    		(since C99)

    Example

    코드 실행 
    #include <stdio.h>
#include <stdbool.h>
#include <stdalign.h>

int main(void)
{
    printf("%d %d %d\n", true && false, true || false, !false);
    printf("%zu\n", alignof(char));
}

    Output: 

    0 1 1
1

    References

    • C17 standard (ISO/IEC 9899:2018):
    • 7.15 Alignment <stdalign.h> (p: 196)
    • 7.18 Boolean type and values <stdbool.h> (p: 210)
    • 7.19 Common definitions <stddef.h> (p: 211)
    • 7.23 _Noreturn <stdnoreturn.h> (p: 263)
    • 7.31.9 Boolean type and values <stdbool.h> (p: 332)
    • C11 standard (ISO/IEC 9899:2011):
    • 7.15 Alignment <stdalign.h> (p: 268)
    • 7.18 Boolean type and values <stdbool.h> (p: 287)
    • 7.19 Common definitions <stddef.h> (p: 288)
    • 7.23 _Noreturn <stdnoreturn.h> (p: 361)
    • 7.31.9 Boolean type and values <stdbool.h> (p: 456)
    • C99 standard (ISO/IEC 9899:1999):
    • 7.18 Boolean type and values <stdbool.h> (p: 253)
    • 7.19 Common definitions <stddef.h> (p: 254)
    • 7.26.7 Boolean type and values <stdbool.h> (p: 401)
    • C89/C90 standard (ISO/IEC 9899:1990):
    • 4.1.5 Common definitions <stddef.h>

    See also

    C++ documentation for Type support library