# Type support

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< c

### Basic types

#### Fundamental types defined by the language

#### Additional basic types and convenience macros

Defined in header `<stddef.h>`
size_t | unsigned integer type returned by the `sizeof` operator (typedef)
ptrdiff_t | signed integer type returned when subtracting two pointers (typedef)
NULL | implementation-defined null pointer constant (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)
Defined in header `<stdalign.h>`
alignas (C11) | convenience macro, expands to keyword _Alignas (macro constant)
alignof (C11) | convenience macro, expands to keyword _Alignof (macro constant)
__alignas_is_defined (C11) | expands to integer constant `1` (macro constant)
__alignof_is_defined (C11) | expands to integer constant `1` (macro constant)
Defined in header `<stdnoreturn.h>`
noreturn (C11) | convenience macro, expands to _Noreturn (macro constant)

#### Boolean type support (since C99)

#### Fixed width integer types (since C99)

#### Numeric limits

### References

- C11 standard (ISO/IEC 9899:2011):

  - 7.15 Alignment <stdalign.h> (p: 268)

  - 7.19 Common definitions <stddef.h> (p: 288)

  - 7.23 _Noreturn <stdnoreturn.h> (p: 361)

- C99 standard (ISO/IEC 9899:1999):

  - 7.19 Common definitions <stddef.h> (p: 254)

- C89/C90 standard (ISO/IEC 9899:1990):

  - 4.1.5 Common definitions <stddef.h>

### See also

C++ documentation for Type support library

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