The C programming language was originally designed for and implemented on the UNIX operating system in 1972 by Dennis Ritchie at bell laboratories of AT&T. C evolved from two previous programming languages BCPL and B. Although, C was widely used to develop the UNIX operating system, nowadays also almost all major operating systems are written in C and C++. In 1983 a committee was established to create an ANSI (American National Standards Institute) standard that would define the C language and this was finally implemented in 1989. The resulting standard was typically referred to as ANSI/ISO Standard C. During the 1990s, a new standard for C was developed and is usually referred to as C99. C89 is however the version of C in widest use enjoying the greater compiler compatibility and producing the most portable code.It also forms the basis for C++
Some free C compilers
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