C language is the world's most versatile, the most common high-level computer language. It can write system software, such as computer operating systems, you can also write a variety of applications, it became widely used, most popular, the most popular high-level computer language. So how did the C language development up it?
C language in the early 1970s came out. 1978 by the American Telephone and Telegraph Company (AT & T) Bell Labs has just released the C language. C is a language originally developed 1969--1973 years to the at AT & T Bell Laboratories. According to the inventor of the C language Dennis Ritchie (Dennis Ritchie) said that the most important period of development of the C language in 1972. Ritchie B on the basis of language on the final design of a new language, he took the second letter as the name of the language BCPL, which is the C language.
The birth and development of the operating system unix C language are inseparable. "Portable C language compiler" to promote the release of the unix system, while the original unix operating systems are written in assembly language. In 1973 the core of unix operating system using C language rewritten since then, the C language as the main language of the operating system. In 1978, C language officially released, while the famous book "The C Programming Language" publication. After that, ANSI On the basis of this book on the development of the C language standard.
1970-80's, C language is widely used, from mainframe to mini computer, is also derived from a number of different versions of the C language. Unified C language version, the 1983 US National Bureau of Standards (American National Standards Institute, referred to as ANSI) established a committee to develop a standard C language. 1989 C language standard was approved, known as ANSI X3.159-1989 'Programming Language C'. This version of the standard C language commonly referred to as ANSI C. In 1990, ISO C accepted as the ISO C standard (ISO9899-1990) and in 1994, revised the C language standard. After five years, ISO has been modified from the previous version, this also modified the standard C language, adds some needed function. In 2001 and 2004, the past two years there have been two technical changes.
Up to now, almost all of the development tools support the ANSI C standard. C language is the most widely used version of a standard. Now most popular C language compiler system is based on ANSI C development as the foundation, but the language features and syntax rules of different versions of the C compiler system being implemented also slightly different.