C17 (C standard revision)

Common card · No. 433766

C17, formally ISO/IEC 9899:2018, is an open standard for the C programming language, prepared in 2017 and published on 5 July 2018. It replaced C11 (standard ISO/IEC 9899:2011), and is superseded by C23 (ISO/IEC 9899:2024) since October 2024. Since it was under development in 2017, and officially published in 2018, C17 is sometimes referred to as C18.