C tokens in C programming

2. In a passage of text, individual words and punctuation
marks are called tokens. Similarly, in C programming the
smallest individual units are known as C tokens.
C language has six types of tokens, and programs are
written using these tokens and the syntax of the
language.

3. Keywords Identifiers Constants Strings
Special
Symbols
Operators

4.  Keywords serves as the building blocks for a program statements. All
keywords have a fixed meaning and cannot be changed.
 Keywords cannot be used as normal identifier names.
Few Examples of keywords used in C are listed below
 int
 break
 goto
 char
 switch
 void

5.  Identifier refers to the name of variables, functions and arrays. These are
user defined names and consists of a sequence of letters and digits.
 Both uppercase and lowercase letters can be used, and c language is case
sensitive. A special symbol underscore ( _ ) is also permitted.
Rules For Identifiers
 First character must be an alphabet.
 must consist of only letters, digits or underscore.
 Should not be a keyword and should not have any blank space.
 Example:- int num;
char name;
Where num and name are identifier names.

6.  Constants refers to fixed values that do not change during the execution of
a program.
Basic types of C constants are shown in the flowchart
Constants
Numeric
Constants
Integer
Constants
Real
Constants
Character
Constants
Single
character
constants
String
constants

7.  Strings are nothing but array of characters ended with null character (‘0’).
This null character indicates the end of the string.
Strings are always enclosed by double quotes. Whereas, character is
enclosed by single quotes in C.
 Example :- char name[10];
In this example the variable name can store up to 10 bytes.

8.  The following special symbols are used in C having some special meaning
and thus, cannot be used for some other purpose.
[] () {} , ; : * … = #
Braces{}: These opening and ending curly braces marks the start and end of
a block of code containing more than one executable statement.
Parentheses(): These special symbols are used to indicate function calls and
function parameters.
Brackets[]: Opening and closing brackets are used as array element
reference. These indicate single and multidimensional subscripts.

9.  The symbols which are used to perform logical and mathematical
operations in a C program are called C operators.
Operators used in C program are
 Arithmetic operators
 Assignment operators
 Relational operators
 Logical operators
 Bit wise operators
 Conditional operators (ternary operators)
 Increment/decrement operators
 Special Operators