The
stddef.h header defines various variable types and macros. Many of these definitions also appear in other headers.
Library Variables
Following are the variable types defined in the header stddef.h −
| S.N. |
Variable & Description |
| 1 |
ptrdiff_t
This is the signed integral type and is the result of subtracting two pointers.
|
| 2 |
size_t
This is the unsigned integral type and is the result of the sizeof keyword.
|
| 3 |
wchar_t
This is an integral type of the size of a wide character constant. |
Library Macros
Following are the macros defined in the header stddef.h −
| S.N. |
Macro & Description |
| 1 |
NULL
This macro is the value of a null pointer constant. |
| 2 |
offsetof(type, member-designator)
This results in a constant integer of type size_t which is the offset
in bytes of a structure member from the beginning of the structure. The
member is given by member-designator, and the name of the structure is given in type. |
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