C Keywords and Identifiers - C Programing

In this tutorial, you  learn about keywords; reserved words in C programming that is the  part of the syntax. Also, you  learn about identifiers and how to say name of them

Character set

In C language we can create words, Numbers and Expression using characters based on the coamputer on which the program is running, its character representing the same Alphabet Number or Special symbol. Which is used to represent Intromation.

Alphabets

Uppercase: A B C ................................... X Y Z
Lowercase: a b c ...................................... x y z

C take  both of  lowercase and uppercase alphabets as variables and  also functions.

Digits

Digit are -: 0 1 2 3 4 5 6 7 8 9

Special Characters

Special Characters in C Programming

,	<	>	.	_
(	)	;	$	:
%	[	]	#	?
'	&	{	}	"
^	!	*	/	|
-	\	~	+

White space Characters

Blank space, newline, horizontal tab, carriage, return 

C Keywords

int money;

Here,  int is a keyword which show that   moneyis a variable of type int  (integer).

You know  C is a case sensitive language, all keywords  is written in lowercase. this  is a list of all keywords allowed in ANSI C.

C Keywords

auto	double	int	struct
break	else	long	switch
case	enum	register	typedef
char	extern	return	union
continue	for	signed	void
do	if	static	while
default	goto	sizeof	volatile
const	float	short	unsigned

All these keywords, their syntax, and application is discussed in their related  topics. However, if you want a deep  overview of these keywords without going anywhere , visit List of all keywords in C programming.

C Identifiers

Identifiers are names that you give to variables, constants, arrays, and functions, etc. It can also be the name of objects that take different values   but only one at a time

Identifiers must be unique. These are created to give a uneqalled  name to an unit or organisation to identify it during the execution of the program. For example:

int money;
double accountBalance;

Here, money and  accountBalance are identifiers.

Also remember, identifier names is different from keywords. You can not use  int as an identifier because int is a keyword.

Rules for naming identifiers

1. A valid identifier have letters (both uppercase and lowercase letters), digits and underscores. are used as in c
2. The first letter of an identifier is letter or a underscore
3. You cannot use keywords as identifiers.
4. There is no rule on how much long an identifier can be. However, you can run into problems in some compilers when  identifier is longer than 31 characters.
5. If you want You can choose any name as an identifier if you follow the above rule or c programing rule carefully , however, give meaningful names to identifiers that make sense.