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So in this video we were talking about the functions I have already describe the functions in the TV.

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So I we saying again.

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So functions are like, uh.

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Or telling your co-worker to do something and you take the output from your co-worker.

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So it's like there are 50 lines of code which you want to execute like three or four times.

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You don't need to copy all of these lines again and again.

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So you can just simply write one function and you can call that function three times to execute 50 lines

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of code three times.

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So it will be very easy and it saves a lot of space and time.

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So to declare the function, you need to.

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See complete static.

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So the static user as the shared member for this class.

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So it's first it's a white printing something.

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So this is my function.

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And here I'm going to share.

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It's been.

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So this is the function.

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So let's copy this one.

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In our program there is a function printing something.

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Now I can go and guard this one.

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That's Randy's.

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And here you can see the output of this testing.

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Now, I can guard this multiple times.

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I can guard this three times, and I can see three outputs.

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So you can see you can guard this in a follow.

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I then call like 50 or 100 homes or how many times are you going to lose?

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Ah.

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You can also get the return date from this so that.

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Let's rename this function to.

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Yes.

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We can get to spring payments.

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So it's going to bring secret keys to.

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It's so secret.

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And I can send written keywords using this written keyword.

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I can pretend the contents of this secret can be done secretly.

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So the contents of this will be written to do this our main course.

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So again, just as I knew it would spring, the key is equals to test.

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So this test will return something that is the spring and.

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That will be assigned to this key role.

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So this is very similar to spring.

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The key is equal to this value.

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Except this value is getting paid to buy that digital function.

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Now I can go and print of this one.

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Since there is no print statement in this test, we are going to print this key value.

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Sort of wondering this.

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And here you can see our key areas.

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So you can see how useful the functions are or you can just perform some calculations and you can get

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only the result.

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So it's very organized.

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Very.

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And this test of function also accepts the parameters.

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So you want to do a function that calculates something, you want to send some values to that function.

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So let's say in the year going to be.

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And the return type is integer because we are going to perform operations on bigger.

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I can directly set the time you start.

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So this will return the multiplication of that year.

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And we.

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Now again, the end result is equal to.

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It's tough.

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And now here you can see that we should also highlighting the parameters in the file that gives me that

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beat.

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So let's go and get this result.

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Now, if you add this and we get divided party, so it's much more flexible, we can see already.

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I can also pass the shooting parameters, you guys of pass pass an area as well.

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And one more thing, too.

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There is these other local variables for this function.

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So these are like temporary variables that this that this function uses to do the calculations.

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If I go and actually see is goes to find these equals actually you will not get any error because these

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are the main functions of variables and these are the local well was for this test.

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So what we're actually doing is we are passing the values of these variables which are five and six.

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So it's not really, really to stuff the values of eight that is traditional programming six And these

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very common six will be copied in this respect to parameters.

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We are in B which are local to business for brands.

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And we can see we can still see the reserves that we get the output and this is called car value.

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So we are just copying the value that is without actually sending out results.

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So if you send the address of this variable, we're actually modifying the contents of the address.

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So that is the directory reflects this variable.

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So let's.

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We can refinance into B, so we use our reference.

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Reference.

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Okay.

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We are not changing.

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Right?

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So let's go and change this one.

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Oh, let's see.

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Here is equals to.

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Yes, Darby.

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The attorney.

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We're not here to actually witness you being.

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This.

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Even though when you return this will be stored in the reserve, but that your values will still be

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changed.

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Now let's go and put into the.

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Here, you.

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So it's going to end this year.

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Where you.

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Now you go to five and you score two six, right?

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So that's actually a modest return.

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And we can see Lloyd.

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And the modest one.

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So we actually performing operation by passing the addresses of this year and we and we are printing.

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Before you.

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Yes.

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Yeah.

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And copy this line and paste here.

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So we are actually printing the values before calling the function and after calling the function,

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it's going to run this.

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And here we can see and before the year values file and after it values that be.

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So then we are printing that.

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So this is called call by reference.

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So that means we are passing our Drosophila into this one.

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And this function takes the content of the address and performed the operations and stores in that same

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address.

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So we are actually modifying the contents of the items.

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If you don't do the study, you need to create the object for this and you need to call that using that

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object.

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So that's how for these functions.