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[diff.null]
# Annex C (informative) Compatibility [[diff]](./#diff)
## C.8 C standard library [[diff.library]](diff.library#diff.null)
### C.8.3 Modifications to definitions [[diff.mods.to.definitions]](diff.mods.to.definitions#diff.null)
#### C.8.3.4 Macro NULL [diff.null]
[1](#1)
[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/compatibility.tex#L3753)
The macroNULL,
defined in any of[<clocale>](clocale.syn#header:%3cclocale%3e "28.3.5.1Header <clocale> synopsis[clocale.syn]"),[<cstddef>](cstddef.syn#header:%3ccstddef%3e "17.2.1Header <cstddef> synopsis[cstddef.syn]"),[<cstdio>](cstdio.syn#header:%3ccstdio%3e "31.13.1Header <cstdio> synopsis[cstdio.syn]"),[<cstdlib>](cstdlib.syn#header:%3ccstdlib%3e "17.2.2Header <cstdlib> synopsis[cstdlib.syn]"),[<cstring>](cstring.syn#header:%3ccstring%3e "27.5.1Header <cstring> synopsis[cstring.syn]"),[<ctime>](ctime.syn#header:%3cctime%3e "30.15Header <ctime> synopsis[ctime.syn]"),
or [<cwchar>](cwchar.syn#header:%3ccwchar%3e "28.7.3Header <cwchar> synopsis[cwchar.syn]"),
is an implementation-defined null pointer constant in
C++ ([[support.types]](support.types "17.2Common definitions"))[.](#1.sentence-1)