What are Tokens in c language?

Tokens:-

                  Tokens are the smallest individual unit of any language . It is the smallest element in the 'C' language .

Tokens are :-

1. Constant
2. Keyword
3. Identifiers
4. Punctuation
5. Operators

1. Constant :- A constant value is the one which does not change during the execution of a program

  Types of constant:-

1.  Integer Constant
2. Real Constant
3. Character Constant
4. String constant

2. Keyword :- The word which have special meaning to the compiler is called keyword. The meaning of keyword can't be changed. They are also called reserved word . Keyword can't be used as a variable name . They are 32 keywords in 'C' . All keyword are in lower case .

List of keywords

1. auto                           
2. break 
3. case
4. char
5. const
6. continue
7. default
8. do
9. double
10. else
11. enum
12. extern
13. float
14. for
15. goto
16. if
17. int
18. long
19. register
20. return
21. short
22. signed
23. size of
24. static
25. struct
26. switch
27. typed ef
28. union
29. unsigned
30. void 
31. volatile
32. while

3.Identifiers/ Names

Identifiers is the name of user-defined variable, array and functions .

'C' is a case-sensitive language that is upper case and lower case alphabets are different for 'C'.

  Ex- 'Num' and 'num' are two different identifiers for c language.

Rules of identifiers :-

• First character must be an alphabet or underscore.
• Identifiers name must consist of only letters, digits and underscore.
• An Identifier should have less than 31 characters.
• The keyword can not be used as identifiers.
• No comma or blank are allowed with in an identifier.

4.Punctuations:-

Semicolons,colons,commas,apostrophes,quotations mark,braces,brackets and parentheses .

 ; : , ' " () {} [] * = # .

5. Operators :-

• Assignment Operator
• Arithmetic Operator
• Relational Operator
• Logical Operator
• Increment Operator
• Decrement Operator
• Boolean Operator
• Bit-wise Operator
• Size of() Operator
• Comma Operator