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1                             VARIABLES IN REAL LIFE












                         Learning Outcomes

                      Introduction                                 What is Variable Initialization?
                      Data Types in Programming                    How do we Validate User Input in Programming?

                      Math Operations in Programming





                 INTRODUCTION

                 In your previous class, you had learned that a variable is a packet to store data which can
                 be named, referenced. In this class, you are going to learn more about variables and how
                 they are used in a program.


                 WHAT IS VARIABLE INITIALIZATION?
                 To use variables in programming, first we need to create

                 the variables and assign them a reference in the computer
                 memory.

                 Variable is  a storage area which  the  programs can
                 manipulate by changing the values stored in it.

                 Create/declare a variable
                 Syntax is a rule which must be followed while performing a task.

                 In most of the programming languages, you can declare a variable by using the following syntax:
                 Datatype VariableName=Value;


                   Example 1: Declaring a variable.                                                   Subject Enrichment
                   int x=20;

                   int y=30;


                 int x, int y will create two variables ‘x’ and ‘y’ and it reserve two memory locations with names
                 ‘x’ and ‘y’. Variables are created by using the ‘int’ keyword. ‘int’ specify the data type which
                 means that the declared variable will store integer values ‘20’ and ‘30’ in these two variables.

                 Once the variable is created, you need to assign it a value before using it. This process of
                 assigning a value to a variable is called initialization.

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