stddef.h Header File

Header File Index

ANSI definitions of default macros and types

 Functions
offsetof
Returns the offset of a member in a structure.
 Constants
NULL
A null-pointer value.
 Predefined Types
ptrdiff_t
A type to define the result of subtracting two pointers. [Explanation] ptrdiff_t is a type proposed by ANSI C for defining the result of subtracting two pointers (e.g. the first address after the end of an array minus the beginning of the array).
size_t
A type to define sizes of strings and memory blocks.