<stddef.h>        -        Common definitions

The header provides definitions of frequently used types and macros. A partial listing of the header illustrated sefinitions for the type ptrdiff_t, size_t and macros offsetof and NULL.

typedef int ptrdiff_t;

typedef unsigned size_t;

typedef insigned char wchar_t;

#define offsetof(st, member) (size_t) (&((st*)0) -> member)

#define NULL 0

 

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