Keywords

                                         Keywords

Constant is an entity that does not change during program execution. Example when we write number=10 than 10 is constant in all program and never change value.

There are mainly two types constants:
  
 Primary constants
            Integer constant
            Real Constant
            character Constant
 Secondary Constants
            Array
            Structure
            Pointer
            Union
Rules for construction Integer Constant

    At least one digit must have an integer constant
    It can be positive or negative. The general range of integer constant is -32768 to +32767
    No commas or blank spaces are allowed within integer constant.
    Integer constant must not having decimal point.
    Example of integer constant are as 364,-66,+786,-1

Rules for constructing Floating point or Real constant

    At least one digit must have an real constant.
    Real constant must have decimal point.
    It may be positive or negative.
    No commas or blank spaces are allowed within real constant.
    Example of real point constant : +23.0, 786.786, -0.786, 0.0

 Rules for constructing Character constant

    Any single entity(like as single alphabet, single digit or single symbol) are enclosed within single inverted     commas, are called character constant.
    Example of Character constant : 'a', 'A', '*', '4' etc..

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