During the end of 1970 and 1980 years of version C have been carried out for a wide variety of the basic computers, minicomputers and microcomputers, including personal computer IBM-PC as its popularity has started to increase considerably.


In 1983 the American National Institute of Standards (ANSI) has generated committee, X3J11 to establish standard specification C. In 1989 the standard has been ratified as ANSI X3.159-1989 "Programming language C." This version of language is mentioned often as ANSI C, Standard C or sometimes C89.


In 1990 ANSI C the standard (with formatting of changes) has been accepted by the International organisation on Standardization (the International Organization on Standardization) as ISO/IEC 9899:1990 which sometimes name C90. Therefore, terms "C89" and "C90" concern besides to the programming language.



ANSI, as well as other national bodies on standardization, any more are not developed by standard C independently, but submits to the International Organization on Standardization C. National acceptance of updatings to the international standard typically occurs within a year after the publication of the International Organization on Standardization.


One of the purposes of process of standardization C consisted in making superset K&R C, including many of informal features, subsequently the entered. The committee on standards also switched on some additional features, such as function pre-production models (borrowed from C ++), void indexes and others. Syntax for parametre declarations also has been increased to switch on the style used in C ++ though interface K&R continued to be resolved for compatibility with the existing initial text.


C89 The majority of code C written now is supported by stream C of compilers, and, based on it. Any program written only in Standard C and without any assumptions dependent on hardware, will operate correctly on any platform with adaptation C by performance, within its resources. Without such precautions of the program can be going to only on a certain platform or with the specific compiler, for example, to use of non-standard libraries, such as libraries GUI, or to confidence concerning the compiler - or the signs defined for a platform, such as the exact size of types of data and byte endianness.