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C99
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{{short description|C programming language standard, 1999 revision}} {{About|the programming language dialect}} {{Use dmy dates|date=January 2021}} {{missing information||_Pragma(), FP_CONTRACT, CX_LIMITED_RANGE|date=November 2020}} {{C language revisions}} [[Image:ISO-IEC-9899-1999-cover.png|thumb|180px|Cover of the C99 standards document]] '''C99''' (previously '''C9X''', formally '''ISO/IEC 9899:1999''') is a past version of the [[C (programming language)|C]] programming language [[open standard]].<ref>{{cite web|url=https://www.iso.org/iso/iso_catalogue/catalogue_ics/catalogue_detail_ics.htm?csnumber=29237 |title=ISO/IEC 9899:1999 - Programming languages - C |publisher=Iso.org |date=2011-12-08 |access-date=2014-04-08}}</ref> It extends the previous version ([[C90 (C version)|C90]]) with new features for the language and the [[C standard library|standard library]], and helps implementations make better use of available computer hardware, such as [[IEEE 754-1985]] [[floating-point arithmetic]], and compiler technology.<ref name="grouper.ieee.org">{{cite web |url=https://grouper.ieee.org/groups/754/meeting-materials/2001-07-18-c99.pdf |title=IEEE 754 Support in C99 |website=[[IEEE]] |archive-url=https://web.archive.org/web/20171028003206/http://grouper.ieee.org/groups/754/meeting-materials/2001-07-18-c99.pdf |archive-date=2017-10-28 |access-date=2021-07-15}}</ref> The [[C11 (C standard revision)|C11]] version of the C programming language standard, published in 2011, updates C99.
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