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Okay.

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In this lecture you will learn about the access controls in C++.

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So this is the same code as our previous lecture, right?

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But we will we're going to add some access controls and methods here.

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So access controls, restrict class member access, public and private, or there are two major access

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controls so anyone can access a public member, but only a class can access its private members.

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So all struct members are public by default.

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So private members play an important role in encapsulation.

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So consider here for example, my date and time class.

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So as it stands, the year member here can be accessed from anywhere.

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So for both reading and writing.

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So suppose you want to protect against the value of the year here being less than 2019, so you can

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accomplish this in two steps.

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You make your private and you require anyone using the class consumers to interact with the year.

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Only each row strikes methods.

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So, for example, let's make the.

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Year.

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Private beer.

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And then we're going to add method here named Ops.

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Yeah.

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We're going to add the method.

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Seth.

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Yea.

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We will add this set here with Poul because it will return us.

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True or false?

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And the set year will take an integer new year as a per parameter.

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So for example, if New Year year less than 2019 then return false year and.

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Then.

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Here.

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Here.

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Because New Year's.

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And the return.

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True.

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And we're going to add integer.

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Integer set get here, which will return just an integer.

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And so will return as the integer value of our year variable.

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So let's add this integer.

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Get near here.

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And return year.

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And as you can see here, we made a private integer year here.

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So.

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So let's I want to explain all of this codes again here.

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As you can see here, we cannot use this anymore here.

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So in order to use where we need to, for example, so actually, let's let this.

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So if you want to print something on the screen, you need to use the here.

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The variables here.

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So first we declare the integer my year here and MD that get here.

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So this get here will return you a value that will show you here declared is private member of the sale.

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So.

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As you can see here, we will declare it private here.

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So in order to get this, we will make a function public for now.

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So we need to make a public function here and we will define the private at the end of the code.

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So if we define the private in top of the code, then.

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There are other codes on the bottom here after private will make itself private as well.

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So as you can see here, we cannot directly use here.

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As you can see here, here is private member of my data time.

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So we can use here because here is private here.

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So we define private members at the end of the line here.

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So we need to in order to get here, we need to use function this function here.

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So here, here, here, here and that get here.

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And we showed us the year here and let's change the year end date set here.

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Let's set the year to.

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For example, 2023.

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And here they will get the urge.

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And let's print our code here.

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So as you can see here, we started here from zero because we didn't sign anything on it.

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And then we assign 20, 23 to year.

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And here let's actually assign something on it.

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And date set here.

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So we don't see zero here.

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2019.

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And that's right.

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As you can see here, we got the result here and we successfully assigned 2019 integer on the on the

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year variable here.

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So let's try 2018 or, for example, 2016.

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As you can see here, we got the zero because our if statement, as you can see here, returned false

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and this code here did not execute it.

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So the if statement is triggered and the the other course is not executed in this function.

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So that's why we didn't assign anything on it.