History of C

Written By -


  • Developed by Dennis Ritchie in 1973 .
  • The PDP-11 version of UNIX was written in assembly language.
  • Assembly language are hard to write and understand. So, developers of UNIX OS decided to rewrite UNIX in B language. But B language was insufficient to write UNIX, this led to the development of C language.
  • K&R C – is defined as the first edition of C Language by Brian Kernhigan and Dennis Ritchie, published in 1978.




ANSI is a US standards body that released the first standard specification for C in 1989. The standard was adopted by ISO in 1990 and ISO are now the standards body for the language – not ANSI.
ANSI C just refers to a particular standard for C Language.


Standard of C :


  • C89
  • C99
  • C11


History Table :


LanguageDeveloped byYear
ALGOLInternational Group1960
BPCLMartin Richards1967
BKen Thompson1970
Traditional CDennis Ritchie1972
K&R CBrain Kernighan & Dennis Ritchie1978
ANSI CANSI Committee1989
ANSI/ISO CISO Committee1990


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