C - Approved standards

ISO/IEC 9899 - Programming languages - C

Published ISO and IEC standards can be purchased from a member body of ISO or IEC.

The latest publically available version of the C11 standard is the document WG14 N1570, dated 2011-04-12. This is a WG14 working paper, but it reflects what was to become the standard at the time of issue.

The previous standard for Programming Language C (C99) is ISO/IEC 9899:1999, published 1999-12-01.

Technical Corrigendum 1 (ISO/IEC 9899:1999 Cor. 1:2001(E)) was published in 2001 (additional documentation).

Technical Corrigendum 2 (ISO/IEC 9899:1999 Cor. 2:2004(E)) was published in 2004.

Technical Corrigendum 3 (ISO/IEC 9899:1999 Cor. 3:2007(E)) was published in 2007. It can be obtained free of charge from ISO.

The latest publicly available version of the C99 standard is the combined C99 + TC1 + TC2 + TC3, WG14 N1256, dated 2007-09-07. This is a WG14 working paper, but it reflects the consolidated standard at the time of issue.

The rationale for the C99 standard is available.

The 1990 ISO standard (now outdated) consisted of the following:

• ISO/IEC 9899:1990 Information technology - Programming Language C.
• An amendment (ISO/IEC 9899 AM1) to the C standard was approved in 1995, covering invariant ISO 646 and multibyte support extensions.
• Technical Corrigendum 1 (ISO/IEC 9899 TCOR1) was approved in 1995.
• Technical Corrigendum 2 (ISO/IEC 9899 TCOR2) was published in 1996.