C – Tokens

C – Tokens:

C – Tokens are small and each of every individual unit or parts in a program called tokens.
It has six kinds of tokens. There are

• Keywords (eg: int, while),
• Identifiers (eg: a, b),
• Constants (eg: 5, 10),
• Strings (eg: “Hello”, “Welcome”),
• Special symbols (eg: (), {}),
• Operators (eg: +, /,-,*)

1. Keywords:

• It is pre-defined words in C. (i.e., Fixed words for creating programs in C)
• List of keywords in C language: 

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

2.Identifiers:

• Identifiers are user-defined words in c program such as variable name, function name, array name, and etc.

3.Constants:

• It is a fixed value in C.
• But it can be changed during it’s before execution.
• Users can also create constant throw syntax.

Syntax:
Const data_type variable_name = value;
For example:
The pi(π) value is standard value i.e. 22/7 = 3.14.
4.String:

• Strings are collections of characters or alphabets i.e. words
• It is used to display for users.

5.Special symbols:
It has a special built-in meaning in the C language. 

Expression	Symbols
Asterisk	*
Assignment	=
Ampersand	&
Brackets	[]
Braces	{}
Comma	,
Double-quotes	“
Front lash	/
Parentheses	()
Pre-processor	#
Semi-colon	;

1.   6.Operators:

Operators are symbols and used to perform some mathematics operations.

Six kinds of operators,

1.      Arithmetic operators(+,-,*,/,%,++,--)

2.     Relational Operators (==,!=,<=,>=,<,>)

3.     Logical Operators (&&,||,!)

4.     Assignment Operators(=,+=,-=,*=,/=,%=)

5.     Conditional Operators (?:)

6.    Bitwise Operators(&,|,^,<<,>>)

Example:

#include<stdio.h>

#include<conio.h>

void main()

{

    const int a=5;

    const int b=10;

    int c;

    clrscr();

    c=a+b;

    printf("Addition of a and b value is: %d",c);

    getch();

}

Output:

Explanations:

• Keywords - main,int,printf,clrscr,getch
• Identifiers - a,b,c
• Constants - a=5,b=10
• String- printf(“Addition of a and b value is: %d”,c);
• Special symbols-(),{,},;,”
• Operators -=,+

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