What is Tokens?How many Types?

What is Tokens?How many Types?

In C language the smallest individual units are called Tokens. There are 6 types of Tokens in C language. 

1) Keywords : 

Every word in c language is either keyboard or an identities all keywords have fixed meaning and that meaning cannot be changed all keywords must be in lower case.

The following are keywords in C language.

3) constants : 

In C language constant  are fixed values that cannot be changed during the execute of a program.

There is two types of constants, 

a) Numeric Constants 

b) character constants

A) Numeric constants define two types,

1) Indigers constants

2) real Constants.

1) Integers Constant : 

An integers constant refer to a sequence of digits. These are three types of integers constant.

a) decimal integers

b) Octal integers

c) Hexa decimal integers 

A) Decimal integers :

Decimal integers consists of digits 0 to 9 procedured by an optional plus or minus (+ or - ) sign. 

B) Octal integers :

An octal intigers constant consists of digits from 0 through 7 with leading zero.

C) hexa decimal integers :

And hexadecimal integers constant consist of digits 0 to 9 and proceed by axe proceed by Ox. 

They also include alphabets F or a through f. The letters ye throw F represents the number 10 throw 15.

2) Real constant : 

The number containing decimal point are called real or floating point constant.

This numbers are used to represent values such a prices, distance, temperature and soon.

(Example) 0.0087, 75.432,-2.4

B) Character constants define two types, 

1) single character constants

2) sting constants.

1) single character constants : 

A single character enclose to within a point of single quotes is called single character constants.

(Example) '5' 'water'

2) sting constants :

A string constant is a sequence of characters enclosed in double coats the character may be letters, numbers ,special symbols and blank space.

(Example) "Hello" "1997"