Preface Standards development within the Information Technology sector is harmonized with international standards development. Through the CSA Technical Committee on Information Technology (TCIT), Canadians serve as the Canadian Advisory Committee (CAC) on ISO/IEC Joint Technical Committee 1 on Information Technology (ISO/IEC JTC1) for the Standards Council of Canada (SCC), the ISO member body for Canada and sponsor of the Canadian National Committee of the IEC. Also, as a member of the International Telecommunication Union (ITU), Canada participates in the International Telegraph and Telephone Consultative Committee (ITU-T). At the time of publication, ISO/IEC 24747:2009 is available from ISO and IEC in English only. CSA will publish the French version when it becomes available from ISO and IEC. Scope 1.1 Relation to C Standard Library This International Standard defines extensions to the C standard library that is defined in the International Standard for the C programming language, see Clause 2. Unless otherwise specified, the whole of the C Standard Library is included into this International Standard by reference, see Clause 2. 1.2 Categories of extensions This International Standard defines library extensions to the C Standard Library to support Mathematical Special functions to be added to and