Literal Constants

Definition of Literal Constants :

Litreal constants is a value such as number , string or character , and litreal constant means  how we can write the value of an constant  or variable ? and what is the different formats of  some value ?

in C language we have four different literal constants :
- integer literal .
- float literal .
- double literal .
-character literal .

Classification of literal constants :

In C language we can write literal constant with three different ways such as integer literal constant , literal qualifiers , character literal constant .

Integer Literal Constants :

To write an value of integer type (variable or constant) we must choose one of the following statements :

example:

a=42 ;  // decimal integer

a=0x2a;  // hexadecimal integer

a=052:  // octal integer

a=0b101010; // binary integer

Literal Qualifiers :

Literal  Qualifiers  are group of symbols used to force compiler to treat them as a specific data type .

we use :
.U or u for unsigned 
.L or l for long 
.F or f for float
.The U and L suffixes may be combined to create an unsigned long literal .

character literal constant :

A character is just a singl charchter constant to refer to number or alphabet , ther are many ways to write or represent a literal constant character .

. char inside  single quote ex : 'a'  'f' 'g' '/' etc.

. escape sequence character ex : '/n' .

. integer Ascii format ex : '65' refer and represented 'A' in ascii .

. in list below we have some escape sequence  character  :

escape character	description
\0	NULL
\a	Alert
\n	New line
\r	Carriage return
\t	Horizontal tab
\\	Backslash
\'	single quotes
\"	Double quotes