scope:

This document, Part 2 of ISO/IEC Technical Specification 18661, extends programming language C, as specified in IEC 9899:2011 (C11) with changes specified in Part 1 of ISO/IEC Technical Specification 18661, to support decimal floating-point arithmetic conforming to ISO/IEC/IEEE 60559:2011. It covers all requirements of IEC 60559 as they pertain to C decimal floating types. This document supersedes ISO/IEC TR 24732:2009 (Information technology - Programming languages, their environments and system software interfaces - Extension for the programming language C to support decimal floating-point arithmetic). This document does not cover binary floating-point arithmetic (which is covered in Part 1 of ISO/IEC TS 18661), nor does it cover most optional features of IEC 60559.