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Variable , Constant , Comments in JAVA ?


java

Variable

-A variable can be define as a memory location that stores an data value of a certain type.
-A variable consists of a data type along with a suitable name.
-Assigning a value for a variable for the first time is called initializing a variable.
example int age;




output



first we took integer the declare its value and then print the output.

Constant

-The difference between a constant and a variable is that the value held by a variable can be changed throughout the problem execution . but after a constant has been initialized we can not change the value in it.
example final double pi 21/7  




output



ERROR , because we have already declared the value of PI.


Comments

-Comment can be used to explain written code.
-This will help a person to read and understand the code in future . 
-Comments are ignored by the compiler during compilation.



Whatever is written inside the comments will not be printed because it is only for understanding.

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