This manual presents ANSI C as the standard version of the
C language. Where certain constructs are not available in compatibility
mode, or would work differently, it is noted and the differences
are described.
HP C/HP-UX, when invoked in ANSI mode, is a conforming
implementation of ANSI C, as specified by American National Standard
9899-1990. This manual uses the terminology of that standard and
attempts to explain the language defined by that standard, while
also documenting the implementation decisions and extensions made
in HP C/HP-UX. It is not the intent of this document to
replicate the standard. Thus, you are encouraged to refer to the
standard for any fine points of the language not covered here.