C Programming Language. BASICS Intro
ENGLISH(version)
presented by sanjay verma. 

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BASICS Intro
ENGLISH(version)
presented by sanjay verma

Dennis Ritchie(1941-2011) (Creator Of C Language). 

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C is a General-Purpose, Procedural Programming Language That Was Developed In The Early 1970s at Bell Labs by Dennis Ritchie. It's one of the Most Widely Used Programming languages of All Time And Has Influenced Many Other Programming Languages That Came After It.

Dennis Ritchie(1941-2011)        (Creator Of C Language)

USES OF C IN MODERN WORLD:. Software Programming (Linux)
Embedded Systems (Consumer Electronics)
Application Development (Google)
Game Development (Bgmi,Pubg Etc)
Complier Development ( MS Visual Code )
Scientific And Numerical Computing ( BLAS,LAPACK, Physics , Finance )
Networking And Protocol Development (Webservers, Ip Stacks Etc). 

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Software Programming (Linux)
Embedded Systems (Consumer Electronics)
Application Development (Google)
Game Development  (Bgmi,Pubg Etc)
Complier Development ( MS Visual Code )
Scientific And Numerical Computing ( BLAS,LAPACK, Physics , Finance )
Networking And Protocol Development (Webservers, Ip Stacks Etc)

Character Set A character set is a set of alphabets, letters and some special characters that are valid in C language.. 

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Character Set 
A character set is a set of alphabets, letters and some special characters that are valid in C language.

[image] uppercase: ABC
.. XYZ
Lowercase: abc .
...xyz

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SPECIAL CHARACTERS. [image] A screenshot of a computer Description automatically generated. 

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KEYWORDS. Keywords are predefined, reserved words used in programming that have special meanings to the compiler. Keywords are part of the syntax and they cannot be used as an identifier. For example:. 

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Keywords are predefined, reserved words used in programming that have special meanings to the compiler. Keywords are part of the syntax and they cannot be used as an identifier. For example:

int is a keyword that indicates MONEY is a VARIABLE of type int (integer) As C is a case sensitive language, all keywords must be written in lowercase. Here is a list of all keywords allowed in ANSI C :

IDENTIFIERS. Identifier refers to name given to entities such as variables, functions, structures etc.
Identifiers must be unique. They are created to give a unique name to an entity to identify it during the execution of the program. For example: money And accountBalance are indentifiers.
Error Chances identifier names must be different from keywords For Example: You cannot use int as an identifier because int is a keyword.. 

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Identifier refers to name given to entities such as variables, functions, structures etc.
Identifiers must be unique. They are created to give a unique name to an entity to identify it during the execution of the program. For example:



money And accountBalance are indentifiers.
Error Chances
      identifier names must be different from keywords
      For Example: 
       You cannot use int as an identifier because int is a keyword.

Rules Must Be Remember. A valid identifier can have letters (both uppercase and lowercase letters), digits and underscores.
The first letter of an identifier should be either a letter or an underscore.
You cannot use keywords like int, while etc. as identifiers.
There is no rule on how long an identifier can be. However, you may run into problems in some compilers if the identifier is longer than 31 characters.. 

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A valid identifier can have letters (both uppercase and lowercase letters), digits and underscores.
The first letter of an identifier should be either a letter or an underscore.
You cannot use keywords like int, while etc. as identifiers.
There is no rule on how long an identifier can be. However, you may run into problems in some compilers if the identifier is longer than 31 characters.

VARIABLES. A Variable Is a Container (Storage Area) To Hold Data.
To Indicate The Storage Area, Each Variable Should Be Given a Unique Name (Identifier). Variable names are just the symbolic representation of a memory location. For example: playerScore is a variable of int type. Here, the variable is assigned an integer value 95.
The value of a variable can be changed, hence the name variable.. 

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A Variable Is a Container (Storage Area) To Hold Data.
To Indicate The Storage Area, Each Variable Should Be Given a Unique Name (Identifier). Variable names are just the symbolic representation of a memory location. For example:



     playerScore is a variable of int type. Here, the variable is assigned an integer value 95.
The value of a variable can be changed, hence the name variable.

Rules For Naming A Variable. A variable name can only have letters (both uppercase and lowercase letters), digits and underscore
The first letter of a variable should be either a letter or an underscore
POSSIBLE ERROR
i) You should always try to give meaningful names to variables. For example: firstName is a better variable name than fn.
ii) There is no rule on how long a variable name (identifier) can be. However, you may run into problems in some compilers if the variable name is longer than 31 characters.. 

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A variable name can only have letters (both uppercase and lowercase letters), digits and underscore
The first letter of a variable should be either a letter or an underscore
POSSIBLE ERROR
i) You should always try to give meaningful names to variables. For example: firstName is a better variable name than fn.
ii)

There is no rule on how long a variable name (identifier) can be. However, you may run into problems in some compilers if the variable name is longer than 31 characters.

LITERALS. Literals are data used for representing fixed values. They can be used directly in the code. For Example; 1,2.5, 'd' Etc. 

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TYPES OF LITERALS
 INTEGERS        An integer is a numeric literal(associated with numbers) without any fractional or exponential part.         For Example:-





 FLOATING-POINT        A floating-point literal is a numeric literal that has either a fractional form or an exponent form.         For Example:-

Literals are data used for representing fixed values. They can be used directly in the code.
      For Example; 1,2.5, 'd' Etc

A character literal is created by enclosing a single character inside single quotation marks. For example: 'z', 'x', 's' etc.
ESCAPE SEQUENCES Sometimes, it is necessary to use characters that cannot be typed or has special meaning in C programming. For Example:- \n used for new line. 

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A character literal is created by enclosing a single character inside single quotation marks. 
         For example: 'z', 'x', 's' etc.
ESCAPE SEQUENCES
      Sometimes, it is necessary to use characters that cannot be typed or has special meaning in C programming.
       For Example:- \n used for new line

STRINGS. A string literal is a sequence of characters enclosed in double-quote marks. For Example:-. 

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A string literal is a sequence of characters enclosed in double-quote marks. 
       For Example:-

CONSTANTS       If you want to define a variable whose value cannot be changed, you can use the const keyword. This will create a constant. 
         For Example:-  PI is a symbolic constant; its value cannot be changed.