2/1/2025
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Q)What is the main purpose of an computer program(application)?
=>data processing.
Q)Can data  be processed without storing in RAM(Random Access Memory)?
=>No.
=>Data should be stored in primary memory/main memory/RAM
in order for processing.
Q)How to store data in RAM in a Java application?
=>By using variables
Q)What is a variable?
=>Named memory location is nothing but a variable.
=>Programmers treat a variable as a container to store
data in RAM.
=>The content of a variable can vary and hence the name.

Q)How declare a variable in a Java application?
                       OR
Q)What is the syntax to declare a variable in a Java program?
   
   <data type>    <name of the variable>;

   For eg.
                int a;
Q)What is meant by assignment in the context of a variable?
=>Assigning a value to a variable  is nothing but assignment. I.e.
storing a value into the variable is nothing but assignment.
     For eg.
                a=10;//assignment
		a=40;//assignment

Q)What is meant by initializing a variable?
=>Assigning a value to a variable for the first time is known
as initializing the variable.
       For eg.
                  int a;//variable declaration
		  a=10;//initializing the variable
		  a=50;//assignment
Q)What is meant by defining a variable?
        =>Variable declaration and initialization if happens in a single
	statement, it is known as defining the variable.
	    For eg.    int a=10;//defining the variable
Q)Java program to define two integer variables, add them
and display the sum.
//Addition.java
class  Addition{
    public static void main(String args[]){
         int n1=10;
         int n2=20;
	 int sum=n1+n2;
         System.out.println("The sum of "+n1+ " and "+n2+" is "+ sum);		
    }
}.