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.
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
- Numeric constant
- Non numeric constant
Numeric constant
There are two types of numeric constant
- Integer constant
- 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
- Character constant
- 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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summery
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