C Standard Library
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C - <stddef.h>

The C <stddef.h> header defines several types and macros. Many of these definitions also appear in other header files. These types and macros are available to use in a current program after including the header file using - #include <stddef.h>. All types and macros of this header file are listed below:

Library Types

ptrdiff_t Signed integer type of the result of difference of two pointers.
size_t Unsigned integer type.

Library Macros

Macro constants

NULL Null pointer.