Constant in c language and constant definitions | constant in computer

Constant in c language:- In this post, you will know what is Constant., Constant in c language and constant definitions | constant in computer, string, real, numeric and etc.

if you want to learn about Constant in c language, we will provide you best notes. that I write in my notebook.

Hello, friends today in this post. I tell you about Constant in c language.

Constant in c language and constant definitions | constant in computer
Constant in c language and constant definitions | constant in computer

what is constant in c language?

Constant is in refer to a fixed value that does not change during the execution of the program.

types of constant in c language

There are two types of constant

  1. Numeric constant
  2. Non numeric constant

Numeric constant

There are two types of numeric constant

  1. Integer constant
  2. Real constant

integer constant

An integer constant is a value that is determined at compile time and cannot be changed at run time. An integer constant expression is an expression that is composed of constants and evaluated to a constant at compile time.

there are many integer constant in c language.

Decimal integer constant

There are a sequence of digit from 0 to 9 without fraction part. It may be negative, positive or zero.

Examples

12,499. 0, , -15,44

Octal integer constant

There are sequence of digit from 0 to 7 without fraction part. It may be negative, positive or zero. It must include  0 before the number.

Example

04,244 ,  -0244

Hexadecimal integer constant

There are sequence digit from 0 to 9 and A to F without fraction value. It may be negative, positive Or O  . It must include X.

Example

0x244, -0xA44

Real constant

There are number with fraction part. This is also non age floating point constant.

Example

12.44

Non numeric constant

There are two types of non numeric constant

  1. Character constant
  2. String constant

character constant

There are enclosed in single quote. This constant single character or digit.

Example

‘9’ ‘n’

Note:- character have integer value . known as ASCII

(American standard code for information interchange)

string constant

They are sequence of character digit aur any symbol closed double quote.

Example

“ Hello” “ &ab”

Variable

variable is named location in memory that is used to hold value that can be modified in the program by the instructions.

Example

Int a,b

Float c, d

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