Keywords,Constant & Identifiers in C

                        

                    
 Concept of words:-
The meaningful set of character is known as words.

The words can be categories as:-

1Keywords.
2)Identifiers.
3)Constants.

                                
Keywords :- Predefine or Reserved words.

Keywords are the predefined words that can be used for their specific purpose.
There are only 32 keywords in C

For eg:- int ,for,else,if,break,continue e.t.c.

Identifiers :- User define words.

Identifiers are the userdefined words that can be used to refer the diffrent elements of a program.

For eg:- roll no.,name,age e.t.c.

Constants:- The Constant are the fixed values that remain unchanged throughout the program.

There are following types of Constant.

1)Integer Constant.
2)Floating Constant.
3)Character Constant.
4)String Constant.

Integer Constant:- An Integer Constant is composed of 0 to 9 digit , + or - sign.

For eg :- Roll no (1700)
              Pin code(221001)
              6 (month no)

Floating Constant:- (Real Constant)
Floating Constant is also known as real constant.

A real constant is composed of 0 to 9 digit , + or - sign and the decimal points.

For eg :- 35.5%(percentage)
              3.5 kg (quantity)

Character Constant:- A Character Constant is a singla character that is enclosed with in a single quotation mark.

For eg :- 'A','P','&','+','-' e.t.c.

String Constant:- String Constantis the set of character enclosed with in a double quotation Marks.

For eg:-"Nayanika","Ck77" e.t.c.