View source for C18 (C standard revision)

{{short description|C programming language standard, 2018 revision}}
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'''C18''' (previously known as '''C17''') is the informal name for '''ISO/IEC 9899:2018''',<ref name="ISO2018">{{cite web|url=https://www.iso.org/standard/74528.html|title=ISO/IEC 9899:2018 - Information technology -- Programming languages -- C|website=www.iso.org}}</ref> the most recent [[Engineering:Open standard|standard]] for the [[C (programming language)|C programming language]], published in June 2018. It replaced [[C11 (C standard revision)|C11]] (standard ISO/IEC 9899:2011).<ref name="iso-9899info">{{cite web|url=http://www.iso-9899.info/wiki/The_Standard|title=The Standard - C|website=www.iso-9899.info}}</ref>

C18 will be superseded by [[C2x]].<ref>{{Cite web|url=http://www.open-std.org/jtc1/sc22/wg14/www/wg14_document_log.htm|title=WG 14 Document log|website=www.open-std.org}}</ref>

== Changes from C11 ==
C18 addressed defects in C11 without introducing new language features.<ref name="iso-9899info"/>

The <code>__STDC_VERSION__</code> macro is increased to the value <code>201710L</code>.

== Compiler support ==
List of compilers supporting C18:
* [[Software:GNU Compiler Collection|GCC]] 8.1.0<ref>{{Cite web|url=https://gcc.gnu.org/onlinedocs/gcc-8.1.0/gcc/C-Dialect-Options.html#index-std-1|title=Using the GNU Compiler Collection (GCC): C Dialect Options|website=gcc.gnu.org}}</ref>
* [[Software:LLVM|LLVM]] [[Software:Clang|Clang]] 7.0.0<ref>http://releases.llvm.org/7.0.0/tools/clang/docs/UsersManual.html#differences-between-various-standard-modes</ref>
* [[Company:IAR Systems|IAR]] EWARM v8.40.1<ref>{{Cite web|url=https://netstorage.iar.com/SuppDB/Public/UPDINFO/013857/arm/doc/infocenter/readme.ENU.html|title=IAR Information Center for Arm - Release notes|website=netstorage.iar.com}}</ref>

== See also ==
* [[ANSI C]], C90, [[C99]], [[C11 (C standard revision)|C11]] – previous standards for the C programming language
* C++98, [[C++03]], [[C++11]], [[C++14]], [[C++17]], [[C++20]] – versions of the C++ programming language standard
* [[Compatibility of C and C++]]

== References ==
{{reflist}}

== External links ==
*[https://web.archive.org/web/20181230041359if_/http://www.open-std.org/jtc1/sc22/wg14/www/abq/c17_updated_proposed_fdis.pdf N2176], archived final draft of the standard
* [http://www.open-std.org/jtc1/sc22/wg14/www/docs/n2244.htm N2244], defect report summary for C11
* {{cite web|url=https://gustedt.wordpress.com/2018/04/17/c17/|first=Jens|last=Gustedt|title=C17|date=April 17, 2018|postscript=,}} changes from C11

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{{C programming language}}


[[Category:C (programming language)]]
[[Category:Programming language standards]]

{{Sourceattribution|C18 (C standard revision)|1}}