## Constant in c language and constant

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

### Constant definitions

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

There are two types of constant

#### Numeric constant

There are two types of numeric constant
1. Integer constant
2. Real constant

### Integer constant

#### 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

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

A 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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