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ANSI implementation-defined behavior The American National Standards Institute (ANSI) has adopted a standard that specifies the form and establishes the interpretation of programs written in the programming language C. This standard is detailed in ANSI Document Number X3J11/90-013. The International Standards Organization (ISO) has adopted the functionally equivalent standard which is detailed in the (ISO) Programming Languages -- C, document number ISO/IEC 9899:1990 (E). Both standards provide a list of characteristics and extensions to be implementation-defined. The characteristics and extensions that must be documented is provided in an appendix to the ANSI document, subsection ``F.3 Implementation-Defined Behaviour''.
According to both the ANSI standard, and the ISO standard, each conforming implementation of the C language must be accompanied by a document that defines all implementation-defined characteristics and extensions.
This appendix is organized into the following sections, corresponding to the sections in the appendix to the ANSI document: