Character Set,Identifiers and Keywords by G Krishna Chauhan

C Character Set :

Whenever we write any C program then it consists of different statements. Each C Program is set of statements and each statement is set of different c programming lexims. In C Programming each and every character is considered as single lexim. i.e [ Basic Lexical Element ]

Character Set Consists Of –

Types Character Set

Lowercase Letters a-z

Uppercase Letters A to Z

Digits 0-9

Special Characters !@#$%^&*

White Spaces Tab Or New line Or Space

IDENTIFIERS IN C LANGUAGE:

Each program elements in a C program are given a name called identifiers.

Names given to identify Variables, functions and arrays are examples for identifiers. eg. x is a name given to integer variable in above program.

RULES FOR CONSTRUCTING IDENTIFIER NAME IN C:

• First character should be an alphabet or underscore.
• Succeeding characters might be digits or letter.
• Punctuation and special characters aren’t allowed except underscore.
• Identifiers should not be keywords.
  
  

KEYWORDS IN C LANGUAGE:

Keywords are pre-defined words in a C compiler.

Each keyword is meant to perform a specific function in a C program.

Since keywords are referred names for compiler, they can’t be used as variable name.

C language supports 32 keywords which are given below. Click on each keywords below for detail description and example programs.

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