May 11, 2021 C
The stddef .h header file defines a variety of variable types and macros. Most of these definitions also appear in other header files.
Here are the types of variables defined in the header file stddef.h:
| Serial number | Variable & description |
|---|---|
| 1 |
ptrdiff_t
This is a symbol integer type, which is the result of two pointers. |
| 2 |
size_t
This is an unsigned integer type, it is sizeof The result of the keyword. |
| 3 |
wchar_t
This is an integer type of a wide-character constant size. |
Here are the macros defined in the header file stddef.h:
| Serial number | Macro & Description |
|---|---|
| 1 |
NULL
This macro is a value of an empty pointer. |
| 2 |
offsetof(type, member-designator)
This generates an integer constant of type size_t, which is a structural member relative to the end of the structure.Member is member-designator A given, the name of the structure is type Presented. |