C – Language History

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  • C language is a structure oriented programming language, was developed at Bell Laboratories in 1972 by Dennis Ritchie
  • C language features were derived from earlier language called “B” (Basic Combined Programming Language – BCPL)
  • C language was invented for implementing UNIX operating system
  • In 1978, Dennis Ritchie and Brian Kernighan published the first edition  “The C Programming Language” and commonly known as K&R C
  • In 1983, the American National Standards Institute (ANSI) established a committee to provide a modern, comprehensive definition of C. The resulting definition, the ANSI standard, or “ANSI C”, was completed late 1988.


C standards

  • C89/C90 standard – First standardized specification for C language was developed by American National Standards Institute in 1989. C89 and C90 standards refer to the same programming language.
  • C99 standard – Next revision was published in 1999 that introduced new futures like advanced data types and other changes.

C11 and Embedded C

  • C11 standard adds new features to C and library like type generic macros, anonymous structures, improved Unicode support, atomic operations, multi-threading, and bounds-checked functions. It also makes some portions of the existing C99 library optional, and improves compatibility with C++.
  • Embedded C includes features not available in normal C like fixed-point arithmetic, named address spaces, and basic I/O hardware addressing
  • Operating systems, C compiler and all UNIX application programs are written in C language
  • It is also called as procedure oriented programming language
  • C language is reliable, simple and easy to use.
  • C has been coded in assembly language

Features of C language:

  • Reliability
  • Portability
  • Flexibility
  • Interactivity
  • Modularity
  • Efficiency and Effectiveness

Uses of C language:

C language is used for developing system applications that forms major portion of operating systems such as Windows, UNIX and Linux. Below are some examples of C being used.

  • Database systems
  • Graphics packages
  • Word processors
  • Spread sheets
  • Operating system development
  • Compilers and Assemblers
  • Network drivers
  • Interpreters

Which level the C language is belonging to?

High Level
Middle Level
Low Level
1 High level languages provides almost everything that the programmer might need to do as already built into the language Middle level languages don’t provide all the built-in functions found in high level languages, but provides all building blocks that we need to produce the result we want Low level languages provides nothing other than access to the machines basic instruction set
2 Examples:
Java, Python
C, C++ Assembler

C language is a structured language

Structure oriented
Object oriented
Non structure
1 In this type of language, large programs are divided into small programs called functions In this type of language, programs are divided into objects There is no specific structure for programming this language
2 Prime focus is on functions and procedures that operate on data Prime focus is on the data that is being operated and not on the functions or procedures N/A
3 Data moves freely around the systems from one function to another Data is hidden and cannot be accessed by external functions N/A
4 Program structure follows “Top Down Approach” Program structure follows “Bottom UP Approach” N/A
C, Pascal, ALGOL and Modula-2
C++, JAVA and C# (C sharp)

Key points to remember:

  1. C language is structured, middle level programming language developed by Dennis Ritchie
  2. Operating system programs such as Windows, Unix, Linux are wriiten by C language
  3. C89/C90 and C99 are two standardized editions of C language
  4. C has been written in assembly language

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