What is C Langauges?

C – Language: - C – Language is programming language developed at AT & T’s Bell laboratories of USA in 1972. It was design and written by Dennies Ritchie. To develop the Unix operating system at Bell labs.

The Unix operating system, the C– compiler and essentially all Unix application program have been written in C. C- Language was invented to write an operating system called Unix.

Historical Development of C

By 1960 a horde of computer language had come into existence, almost each for a specific purpose. For example, COBOL was being used for commercial applications. FOROTON was used to engineering purpose and scientific applications. In 1960, International committee was developed to ALGOL. In 1963, Cambridge University was developed to CPL (Combined Programming Language). Basic Combined Programming Language (BCPL) developed by Martin Richard at Cambridge University. In 1970, B language was developed by Ken Thomson at AT & T’s. In 1972, C- Language was developed by Dennis Ritchie at AT & T’s.

Year	Language	Developed by	Remarks
1960	ALGOL	International            Committee	To general, too abstract
1963	CPL	Cambridge University	Hard to learn difficult implement
1967	BCPL	Martin Richard at Cambridge University	Could deal with only specific problems
1970	B	Ken Thomson at AT & T’s	Could deal with only specific problems
1972	C	Dennis Ritchie at AT & T’s	Lost generally of BCPL and B restored

                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       Introduction

As we know that a program is a set of instruction which is written a sequence and in which language, we write a program is called a programming language. So, program must follow a correct syntax of that particulars programming language. The person who write of a program called “Programmer”, which program has own rules and regulation. It is a perfect medium to take the computer.

Characteristics of Programming

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1.     C is a general-purpose programming language which means C is used to write varies application of operating system.

2.     C is portable language because they are run in different environment like computer but c- compiler available in operating system.

3.     C is easy to debug. The compiler is detecting syntax error and display your screen.

4.     C is middle level language which function combination of high-level language and low-level language.

5.     There are fast to detect syntax error and display on your screen.

6.     It is fast programming language.

7.     C is flexible language like easily port one computer to another computer.

8.     There is popular language that not just because it can be used to standalone programming language.

9.     C is structure program that means programming language.

1.  C is used to easily. This software easily available in environment.

Structure of C- Program

A C- program may contain section what that given bellow: -

Documentation section

Link section

Definition section

Global declaration section

main ()

{

Declaration section

Executable section

}

● Documentation section: - Documentation section is consisting of set of comment lines that may name of program like author name and some other.

There are two types:

(I). Single comment line: - This represented two forward slash like this // where write two slash in any line your text goes here while not executable by compiler and it will till ends of line.

(ii). Multiple comment lines: - If be want to write some text as a comments but it is not ending in the single line then we used /* (slash asterisk) to start the comment and these comments line can be more than one lines to ends the comments be used */ (asterisk forward) means anything written between /* and */ will be tried comment and execute by compiler.

For example: -   /* comments */

Note: - Comments is anything like author name (Prem). Any comments like anything.

For example:  /*this is my first program is written by Prem

And it is written on dates 10-01-19 and time */

● Link section: - Link section is used to link to system header file in the program.

For example:   #include<stdio.h>

#include<conio.h>

                         #include<math.>

Note: stdio is called standard input output.

Note: h> is called header file.

OR

Link section: Link section provides instruction to the compilers to link function from the system library.

● Definition section: Definition section is defined as symbolic constant.

● Global declaration section: In this section, we defined the variable that are used in more than function through out the program. So, these are called global declaration section.