Constant
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:
1. Primary constants
i)Integer constant
ii)Real Constant
iii)character Constant
2. Secondary Constants
i)Array
ii)Structure
iii)Pointer
iv)Union
There are mainly two types constants:
1. Primary constants
i)Integer constant
ii)Real Constant
iii)character Constant
2. Secondary Constants
i)Array
ii)Structure
iii)Pointer
iv)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.(NOTE : Normally range depend on compiler.)
• 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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