Type support

 

C

Language

Standard Library

Type support

Dynamic memory management

Error handling

Program utilities

Date and time utilities

Strings library

Algorithms

Numerics

Input/output support

Localization support

Thread support(C11)

Atomic operations(C11)

 

Type support

size_t

ptrdiff_t

NULL

max_align_t (since C11)

offsetof

Numeric limits

 

Basic types

Additional basic types and convenience macros

<stddef.h> 헤더에 정의됨.
size_t	sizeof 연산자로 반환된 부호없는 정수타입 (typedef)
ptrdiff_t	두 포인터를 뺀 경우에 부호있는 정수 타입을 반환한다. (typedef)
NULL	널 포인터 상수 (macro constant)
max_align_t (C11)	a type with alignment requirement as great as any other scalar type (typedef)
offsetof	byte offset from the beginning of a struct type to specified member (function macro)
<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)

Notes

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