Implementation-Defined Behavior

Appendix F and other sections of the American National Standard for Information Systems -- Programming Language C (X3.159-1989) standard designate several C language features as implementation-defined. The ANSI standard for the C language requires that manufacturers document the specifics of these features for their compiler.

This and related pages provide this ANSI-required documentation, and references the relevant sections of the ANSI standard. The references are given in parentheses for each item, for example, (2.1.1.2) .

• Translation (F.3.1)
• Environment (F.3.2)
• Identifiers (F.3.3)
• Characters (F.3.4)
• Integers (F.3.5)
• Floating Point Types (F.3.6)
• Arrays and Pointers (F.3.7)
• Registers (F.3.8)
• Structures, Unions, Enumerations, Bit Fields (A.6.3.9) (F.3.9)
• Qualifiers (F.3.10)
• Declarators (F.3.11)
• Statements (F.3.12)
• Preprocessing Directives (F.3.13)
• Library Functions (F.3.14)
• Locale-Specific Behavior (F.4)

Implementation Dependencies