C Interview Questions and Answers


What is the ANSI C Standard?

In 1983, the American National Standards Institute (ANSI) commissioned a committee,
X3J11, to standardize the C language. After a long, arduous process, including several
widespread public reviews, the committee's work was finally ratified as ANS
X3.159-1989 on December 14, 1989, and published in the spring of 1990. For the most
part, ANSI C standardized existing practice, with a few additions from C++ (most
notably function prototypes) and support for multinational character sets (including
the controversial trigraph sequences). The ANSI C standard also formalized the C
run-time library support routines.

A year or so later, the Standard was adopted as an international standard, ISO/IEC
9899:1990, and this ISO Standard replaced the earlier X3.159 even within the United
States (where it was known as ANSI/ISO 9899-1990 [1992]). As an ISO Standard, it
is subject to ongoing revision through the release of Technical Corrigenda and Normative

In 1994, Technical Corrigendum 1 (TC1) amended the Standard in about 40 places,
most of them minor corrections or clarifications, and Normative Addendum 1 (NA1)
added about 50 pages of new material, mostly specifying new library functions for
internationalization. In 1995, TC2 added a few more minor corrections.

Most recently, a major revision of the Standard, ``C99'', has been completed
and adopted.

Posted by:Richards