Basic Building Blocks and Definition : Token
Meaning
Keyword
A variable is a meaningful name of data storage location in computer memory. When using a variable you refer to memory address of computer
Constant
Constants are expressions with a fixed value
Identifier
The term identifier is usually used for variable names
String
Sequence of characters
Special
Symbols other than the Alphabets and Digits and white-spaces
Operators A symbol that represent a specific mathematical or non mathematical action
C Constants are also like normal variables. But, only difference is, their values can not be modified by the program once they are defined. Constants refer to fixed values. They are also called as literals Constants may be belonging to any of the data type.
Syntax:
const data_type variable_name; (or) const data_type *variable_name; Types of C constant: 1. 2. 3. 4. 5. 6.
Integer constants Real or Floating point constants Octal & Hexadecimal constants Character constants String constants Backslash character constants