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Showing content from https://www.cplusplus.com/reference/cstdio/NULL/ below:

macro

<cstddef> <cstdlib> <cstring> <cwchar> <ctime> <clocale> <cstdio>

NULL

Null pointer

This macro expands to a null pointer constant.

A null-pointer constant is an integral constant expression that evaluates to zero (like 0 or 0L), or the cast of such value to type void* (like (void*)0).

A null-pointer constant is an integral constant expression that evaluates to zero (such as 0 or 0L).

A

null-pointer constant

is either an integral constant expression that evaluates to zero (such as

0

or

0L

), or a value of type

nullptr_t

(such as

nullptr

).



A null pointer constant can be converted to any pointer type (or pointer-to-member type), which acquires a null pointer value. This is a special value that indicates that the pointer is not pointing to any object.

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