WEBVTT

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Variables and Data Types

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In this video we will learn

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what are variables and data types

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Basic arithmetic operations

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Introduction

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Variables and Java are like containers that hold data

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Each with a name and a value

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Data types define the kind of data a variable can store

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Like numbers, decimals, characters, and true or false

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Let's understand this with the help of the code

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Understanding variables and data types

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Here we create a variable named Age of Type Int, integer

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And give it the value 15

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The program prints age 15

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Here in stores whole numbers like 10

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Double stores decimal values like 5.99

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Charge stores a single character like A, Boolean stores, true or false

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Arithmetic operations

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This section shows how we can do math operations with variables

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Here we have given our variables values

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Variable A has the value 10 and variable B has the value 5

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Understanding constants

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Constant is like a variable

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But once you give it a value, it can never be changed

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In Java we use the keyword final to make something a constant

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Here the keyword final means this value cannot change

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PI will always stay 3.14159

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Variables help us store data, data types define what kind of data

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And constants keep important values fixed