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Hello everyone.



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So in today's session we will continue our discussion on constructor and we will also learn one more



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thing which is called this keyword.



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Okay.



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So let's start out with the decision so let's add one more constructive one more pyramid based construct



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but not this time.



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This bedroom a dice construct Beverly take two barometers each.



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Andrew Lambert OK a general number so property age is barometer age and property.



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Rule number is the barometer number.



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Okay.



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Let's add one brain statement also.



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So see out construct three called



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okay.



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So what will happen now.



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If I will create an object with two barometers.



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So student six two parameters 10 and under the value of a general number and what will happen.



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So this will be interpreted as as as six dot student



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Bennett ended.



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So which constructively.



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Which construct grade will be calling.



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So construct better material be called because this is matching constructor Okay so construct them but



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table book called.



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So if I write a six star display now our age and got an order a general number they do not contain garbage



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values.



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Age is simply 10.



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And rule number is a hundred.



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Okay.



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This time did not contain any garbage values.



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Now let's see



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Su let's create a student object.



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STUDENT 6.



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And in order to call constructor three we have to parse two arguments.



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Age and rule number and let's call the display function to a six dart display.



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Okay so we have to run this file first.



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Make positive changes to this file and now we will run this file



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so construct that record.



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Okay then.



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And under this time neither age nor the rule number contain garbage value then is the age under this



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deal or no



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okay.



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So tell me what will happen if I like if I come on down the default constructor so let's come and out.



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The default constructor now what do you think what will happen.



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Okay.



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So as soon as we create any constructor whether this default or betterment praised then the inbuilt



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constructor is not available to us anymore okay.



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And will domestic is not available to us anymore.



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So at this point of time I have only two constructors and both the constructor that parameter based



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constructors.



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Okay so student S1 this line will throw us at it.



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STUDENT As to this plan we also throw us it assemblies to industry this time will also through a set



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away because and then really what happens is how.



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This is how this line is interpreted it will call as One dot student



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so it is trying to call a constructor with no arguments and in this file and in surrender typically



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file I do not have any constructor with zero barometers with zero arguments so I will get an error saying



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like matching constructor not found something like this matching construct the north found or better



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can be like something like this.



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We cannot initialize S1 cannot initialize S1 Why.



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Because the concept is not there.



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Okay.



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Construct is not there.



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So as soon as we create our own goes to bed.



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Default Constructor vanishes.



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Default Constructor goes away.



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Okay now let's see that it



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okay.



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So why this is running.



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Because after doing changes to this file after commenting commenting it out I didn't run this file.



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So first we will run this file okay and now run this file so I've got an idea and you can see that it



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so no matching function for call student student.



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Okay so this is data that we have discussed it cannot find.



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It is not able to find the function okay.



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Now let's experiment with one more thing.



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So what will happen if I like change the parameter name to property name.



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So let's make it all No and let's also make it rule number.



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So the barometer name is the same as the property roll number.



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Okay.



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Barometer rule number is same as the property number.



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They both have the same name.



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So what will happen at this line.



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What do think what will happen.



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Okay so to understand what will happen we have to go back to the class of scope of variable.



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So if you remember scope of a variable let's take an example to understand.



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I have this small code and based in if a is there then 5 goes inside the loop create another variable



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with the same name.



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Let's initialize it with 1 and now let us try to print the value of it.



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So according to me output will be when the output of this line will be one by one.



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Because at this line would come by level to come by level prior to find the closest a compiler will



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try to find the closest a which one is the closest this one is the closest.



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Add this line.



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I have 2 is I have 2 is this one and this one.



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Two ways are visible at this line but come by level try to find the closest one.



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Since this is the closest one output will be 1 Okay.



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Now see here.



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Rule number at this line I have two rule members I have two numbers to rule numbers are visible at this



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line first one is perimeter rule number and the second one is property rule number.



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So what do we think.



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Virtual no compiler consider I think the barometer one way because this is close.



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This is close the property rule number is like defined above.



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Okay.



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Property really embraced defined above.



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So this rule number is the closest.



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So at this land what will happen for the video flow.



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Rule number two.



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Rule number.



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So basically this line means nothing.



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Net result zero net result is zero.



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This line is like absolutely doing nothing.



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Okay.



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So now what I want is already



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our aim is very simple.



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We want this window number to be barometer rule number and this rule number to be property roll number.



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So this is our simple him.



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Now how we can achieve it okay.



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How can we achieve it.



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So there are two methods to achieve this so let us discuss both the methods.



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So the first method is make rule number out again.



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So it was I'd make it out again.



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Make it out again.



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So if the names are different if the name of the property and the barometers name are different then



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there is no confusion at all.



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But now let's come to the second case I want this to be rule number only.



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That is I want property name is same as barometers name.



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Now how we can achieve our aim so we can achieve our aim with the help of this keyword with the help



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of this keyword.



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Now what is this keyword.



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So this holds the address of the current object holds the address of the current object.



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Okay so I think pointer holds memory or this is we have discussed pointers and we know pointers holds



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memory addresses.



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This is also holding the address.



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What does it mean.



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It means this is a pointer variable.



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This keyword is a pointer variable.



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Again this giver is a pointer variable.



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Every function of the class.



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This is a function.



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This is a function constructor is also function but it is a special function.



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This is also a function.



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This is also a function.



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This is also a function.



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Okay so every function of the class every function of class have access to this keyword every function.



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Have this keyword often on their own of their own.



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Okay.



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Now let's see uh how can we achieve our aim with the help of this keyboard.



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So what this uh what this keyboard used to do is call this one what I will do I will create a student



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s with one parameter let certain so this constructor will be called.



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Now what happens is I will get h I will get rule number



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and name is s and let's say that I dust off this memory block is 700 so this function the student the



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student function have discovered.



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So the student will contain a student.



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This will contain 7 ended okay.



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It will contain 700.



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Okay now let's deep dive.



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How this can be used.



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So see when this function is getting called when this concept plays being called what it is doing for



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the value of a into each but whose H whose objects h.



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Okay.



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Whose object's age.



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There are multiple objects we have we have collected many objects but whose s1 s2 s3.



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Whose whose H I am referring to.



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Okay so what happened is whenever you call whenever you call a function of the class you pass the address



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of the object to the function let me let let us understand with the help of an example.



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Okay so whenever I create an object let's say I created object s with two barometers.



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Then it ended.



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So what.



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This function will do this function will call this construct to construct the number t matching constructor.



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Okay.



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And let's say this is H and this one is rule number and that and this is 700.



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So this student function have discovered now this keyword will contain 700 via 700.



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Because then this is when this call is when this call is there it passes 700 it passes the object it



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passes the address of the object to 700 is being passed.



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So that's way seven hundred will get stored in this point.



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No.



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When I do so at this line of what I'm doing.



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Age equals a put the value of a in each but whose age.



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How do I know whose age this age this is.



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With the help of this I can data friends that I am talking about S1 I'm talking about as.



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So this each so age equal say implicitly this implicitly it is interpreted as this arrow age is a.



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Okay.



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So this contains seven hundred so seven hundred arrow age is a what is the value of a ten.



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Similarly this adorable number is containing hundred okay.



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This is same as star.



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This dark age is.



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Okay so this is how it works.



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So whenever I object calls a function it will pass.



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It will give them function its address and that address will be stored in that this keyword update function.



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Okay so this is how it works.



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Okay so now let us know let us see in code.



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Let us try to print the value of this.



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What this contains.



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Okay so which class supply should I.



191

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Okay so let's first comment out everything.



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So to avoid this or to avoid confusion



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so I am commenting out everything to avoid confusion.



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Now let us create some objects.



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Okay.



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I am creating object as one.



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Now let's say uh it contains two barometers age and the rule number.



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Now let us branded the best of S1 so c out



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C older.



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This of S1 how we can get this off.



201

00:13:49,160 --> 00:13:52,410

S1 using the address operator.



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So where does off S1 Okay so it will call this one this constructor.



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Now this constructor has access to this keyword.



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So the address of s so that s of S1 will be stored in this keyboard.



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This is a pointer a pointer variable.



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So this and and line.



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Okay let's send this file.



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Now let us also read this file



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C and it does of S1 is this one and this also contains the same address okay.



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So this will contain this is containing that dose of S1.



211

00:14:40,360 --> 00:14:45,400

Similarly if we will create more objects I am creating one more object.



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Let's call it S2 and led to the values R and D and 200



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let us spend the Nestle festival



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now that doesn't decide



215

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so at this office when this what I've seen and does a festival and that dress off as to is in this this



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point are valuable.



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OK.



218

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So I hope you understood the point.



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Whenever I object calls a function it will pass its address and here in this function that address will



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be stored in the variable.



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This in the keyword this Okay so age you could say this implicitly is interpreted as this ad age.



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But using this is optional using this is optional.



223

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Okay.



224

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Similarly using this is optional for here.



225

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Here also here also using this option you can use this or if you don't want to use then don't use it.



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It is optional here but in this case see in this case where the parameter name is same as the property



227

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name head it is mandatory for us to use this operator to use this keyword sorry.



228

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So here it is mandatory



229

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here.



230

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It is mandatory to use this.



231

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Why does mandatory.



232

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Because we have to differentiate between the barometer role member and the property remember but



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okay so how we will call this function we will create an object student test with one parameter let's



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say 10 so all number is containing 10.



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This function will be called and let's say it does is 200.



236

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So I have a memory block which s age and rule number and IDs addresses 200.



237

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So 200 is being passed these two hundred will be stored in this keyword of this function.



238

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So this contains 200.



239

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So what I'm doing here is this at oral Lambert



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is better midazolam but so better midazolam but is Ben and this at room.



241

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This this this is containing so I want 200 so 200 adderall but is Ben okay.



242

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So this is how it works.



243

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I hope you haven't destroyed everything.



244

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Okay.



245

00:17:32,390 --> 00:17:34,840

So what we learned in today's session.



246

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So we learned verdict I suppose we learned how they are created automatically how they are called automatically



247

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with every class we get a default constructor for free.



248

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How can we create our own constructor with different parameters.



249

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And at last we see what is this keyword and how to use it.



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Okay.



251

00:17:55,340 --> 00:18:01,520

Okay so one more thing that I want to cover is suppose I want to add a constraint.



252

00:18:01,760 --> 00:18:06,330

I want to add a constraint what constraint.



253

00:18:06,560 --> 00:18:17,750

I want every object I I want property age should not contain garbage value property age should not contain



254

00:18:17,840 --> 00:18:18,740

any garbage value.



255

00:18:18,770 --> 00:18:20,510

So how can I achieve this goal.



256

00:18:20,510 --> 00:18:23,570

How can we add this constraint on the object.



257

00:18:23,570 --> 00:18:31,510

So what I will do I will write a bottom or trace constructor just like this one so I will write a better



258

00:18:31,510 --> 00:18:34,660

modest constructor so student.



259

00:18:34,780 --> 00:18:38,680

This better modest concept will take ages and put and this will do.



260

00:18:38,710 --> 00:18:39,890

Age equals a.



261

00:18:40,820 --> 00:18:47,780

So as soon as I created this bad image tries to construct that as soon as I created this paramedic's



262

00:18:47,830 --> 00:18:51,780

constructor default constructor is no longer available.



263

00:18:52,130 --> 00:18:55,410

Default Constructor goes away it is not there.



264

00:18:55,460 --> 00:18:56,030

Okay.



265

00:18:56,030 --> 00:19:02,900

So whenever a person wants to create the object of student class what it will do first of all it will



266

00:19:02,900 --> 00:19:10,370

try to do student s but this will throw at it why I did because there is no matching function no matching



267

00:19:10,370 --> 00:19:12,410

constructor will be dead.



268

00:19:12,520 --> 00:19:13,010

Okay.



269

00:19:13,050 --> 00:19:14,660

There is no matching constructor.



270

00:19:14,660 --> 00:19:20,200

And similarly if he tried to pass two by two arguments let's say 10 and under.



271

00:19:20,330 --> 00:19:23,780

This would also throw us at a because there are no matching constructor.



272

00:19:23,810 --> 00:19:31,920

So ultimately if he wants to create object of student class he has to give one value he has to give



273

00:19:31,920 --> 00:19:39,260

one integer value as parameter and this integer value will call this paramedic's constructor.



274

00:19:39,260 --> 00:19:44,370

And this the age will be set to die days will be said 210.



275

00:19:44,540 --> 00:19:50,990

Okay so in this way my property age cannot contain a garbage value.



276

00:19:50,990 --> 00:19:57,920

Okay so for creating the object of student class the user have to give one digit argument.



277

00:19:58,070 --> 00:20:00,980

Okay so this is how we can add constraints.



278

00:20:01,340 --> 00:20:01,780

Okay.



279

00:20:01,910 --> 00:20:07,320

How we are able to add constraints because as soon as we create any constructor any whether this barometer



280

00:20:07,310 --> 00:20:13,460

used or default or any other type of question that this default constructor is no longer available since



281

00:20:13,460 --> 00:20:15,780

this default constructor is no longer available.



282

00:20:15,890 --> 00:20:18,630

This statement is not valid anymore.



283

00:20:19,640 --> 00:20:23,470

Okay so I hope everything is fine.



284

00:20:23,470 --> 00:20:24,250

So thank you.