C Language

Introduction to c

Objective :-

  1. Why C language is so important ?

  2. History of C language

1.) Why C language is so important :-

  -> Oracle is written in C

  -> Core libraries of android are written in C

  -> MySql is written in C

  -> Almost every device driver is written in C

  -> Major part of web browser is written in C

  -> Unix operating system is developed in C

  -> C is the world most popular programming language

  -> C is important to build programming skills

 2.) History of C language :-

-> Developer of BCPL(Basic Combined Programming Language) is

     (Martin Richards) developed by in 1966.

-> Developer of B language is (Ken Thompson)

-> 1969

-> Also developer of Unix operating System.

-> He also developed first master level chess called (Belle) in

     1980

-> Developer of C language is (Dennis Ritchie).

-> in 1972

-> At AT & T’S Bell labs , USA

-> Co-developer of Unix Operating System.      

Identifiers in C :-

Identifiers :-

1.Constant

2.Variable

3.Keywords

Constants:-

-> Any information is constant

-> Data = Information = Constant

Types of Constant:-

  1. Primary Constant.

  2. Secondary Constant.

1.) Primary Constant :-

  -> Integer

  -> Real

  -> Character

2.) Secondary Constant :-

  -> Array

  -> String

  -> Pointer

  -> Union

  -> Structure

  -> Enumerator

Variable :-

  -> Variables are the names of memory locations

       where we store data.

Rules :-

  -> Variable name is any combination of alphabets , digit and

       underscore.

  -> A valid variable name cannot start with digit.

  Instructions :-

1.Data type declaration Instruction.

2.Input Output Instruction.

3.Arithmetic Instruction.

4.Control Instruction.

1.) Data type Declaration Instruction :-

  a) Data type :-

    -> int

    -> char

    -> float

    -> double

    -> void

  b) Declaration Statement :-

    int  a , b=5;

    float k;

   

2.) Input Output Instruction :-

a)Standard input output Device:

  -> Keyboard is standard input device.

  -> Monitor is standard output device.

b)printf() :

  -> printf() is not a keyword.

  -> printf() is a predefined function.

c)Program:

  -> main(){

  printf(“manu dhaker”);

  }

d) output:

  -> manu dhaker

3.) Arithmetic instruction :

-> An instruction which is used to manipulate data using operators is

     known as arithmetic instruction.

-> There is no BODMAS in c.

-> 3 + 4 * 5

-> Ans : 35 is wrong and 23 is right

-> here 3 , 4 and 5 are operands and + and * are operators.

Type of operators :

  1. Unary Operator

  2. Arithmetic Operator  

  3. Bitwise operator

  4. Relational Operator

  5. Logical operator

  6. Conditional operator

  7. Assignment operator