C is a general-purpose high level language that was originally developed by Dennis
Ritchie for the Unix operating system. It was first implemented on the Digital
Eqquipment Corporation PDP-11 computer in 1972.
The Unix operating system and virtually all Unix applications are written in the C
language. C has now become a widely used professional language for various
It's a Structured language
It produces efficient programs.
It can handle low-level activities.
It can be compiled on a variety of computers.
C was invented to write an operating system called UNIX.
C is a successor of B language which was introduced around 1970
The language was formalized in 1988 by the American National Standard
By 1973 UNIX OS almost totally written in C.
Today C is the most widely used System Programming Language.
Most of the state of the art software have been implemented using C
C was initially used for system development work, in particular the programs that
make-up the operating system. C was adoped as a system development language because
it produces code that runs nearly as fast as code written in assembly language. Some
examples of the use of C might be:
All the C programs are writen into text files with extension ".c" for example NewFile.c.
You can use "vi" editor to write your C program into a file.
This tutorial assumes that you know how to edit a text file and how to write
programming insturctions inside a program file.
When you write any program in C language then to run that
program you need to compile that program using a C Compiler which converts
your program into a language understandable by a computer. This is called
machine language (ie. binary format). So before proceeding, make sure you
have C Compiler available at your computer. It comes alongwith all flavors
of Unix and Linux.
If you are working over Unix or Linux then you can type gcc
-v or cc -v and check the result. You can ask your system
administrator or you can take help from anyone to identify an available C
Compiler at your computer.
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