NULL

 

C

Language

Standard Library

Type support

Dynamic memory management

Error handling

Program utilities

Date and time utilities

Strings library

Algorithms

Numerics

Input/output support

Localization support

Thread support (C11)

Atomic operations (C11)

 

Type support

size_t

ptrdiff_t

NULL

max_align_t (since C11)

offsetof

Numeric limits

 

Defined in header <stddef.h>
Defined in header <string.h>
Defined in header <wchar.h>
Defined in header <time.h>
Defined in header <locale.h>
Defined in header <stdio.h>
#define NULL /*implementation-defined*/

Expands into implementation-defined null-pointer constant.