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Welcome back in this video, we're going to finalize our application, and therefore I'm just going

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to get started by.

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Well, copy and paste this code because this is basically where the calculation happens, right?

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So we check, is it the minus?

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If it's a minus, then we're going to split it at the minus and then we do the calculation here at the

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bottom.

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So now we just need to replace this or do the same thing with a bunch of ifs for the other operations.

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So here let me add else, if then else, and paste it in.

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So now I have all four operations here.

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So let's start with the minus.

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We have that now let's go over to the plus.

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So let's add the plus here and add it in the calculation itself as well.

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Now let's add the division slash and do the same thing here, and then we just need another one, which

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will be the multiplication.

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So here we just need to add the multiplication like so and of course, we mustn't forget it here at

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the bottom and the actual multiplication as well.

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OK, so now let's try this once again.

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So 99 Times 99 gives nine thousand eight hundred and one.

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Now 66, it was actually let's use sixty six times three.

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Well, B 198.

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That's good.

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Now 99, divided by 66 will be 1.5.

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And 66 minus.

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Thirty three will be 33.

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Plus fifty five is eighty eight, minus sixty eight is twenty and so forth.

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So you see that works fine.

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Now at this point, you could say I am not super happy with their constantly being a dot zero at the

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end.

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So if we are working with just whole numbers, I want to get rid of this dot zero and you already know

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more or less how this can be done.

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You could use a substring, you could use a split here, so both would be fine.

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I'm just going to show you my solution to it, and that is going to be a new method that will take care

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of just that.

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So here I'm going to create this new private function called remove zero after.

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Dot.

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All right.

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And it needs to get the result type string and it will return a string itself.

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So the result will be the result of our calculation, and then it will take that and it will return

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a string without the dot zero.

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So first of all, let's get the value, which will be our result at the beginning.

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So when we start, the value will be the result and we only change it if we actually need to change

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it, which means if the result contains.

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The string of dots zero, which means ninety nine point zero, 33.0 and so forth.

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If that's the case, then let me set the value to be the result of the sub string of zero.

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Well, start index zero all the way up to result that length minus two.

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So what is going on here?

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Well, let's just use this here and play the codling.

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So we had this Helloworld example earlier.

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And here I'm going to use this result.

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Length minus two.

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OK, so what will this return?

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Let's run it.

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And of course, my string needs to be used here instead of result.

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So here is going to be a returned empty space war.

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So what it does is it starts at position zero, which is just empty space, and it goes all the way

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to the length of the entire string, which is 11.

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So we have 11 entries minus two, so it goes all the way to index nine, which means it goes all the

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way to this hour and doesn't use this L.D.

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Maybe it's going to be easier if we actually are going to use these as strings here, like the numbers

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of strings.

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You can see it starts at Index five, which is this number here, and it goes all the way up to everything

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except for the last two entries.

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So this eight nine is going to be excluded.

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It's the same as if it were saying 90.0, and we start at Substring Index zero and go all the way to

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length minus two, which means we just get 90.

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So we are eliminating the dot zero here with this substring.

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And now, of course, we need to return value, so here, return value, like so.

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And by the way, what you see here, I'm using this f clause without curly brackets because I just have

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one line of code that will be executed for this if statement, if it's true.

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So now we return value, which means now we can go ahead and remove zero after dot for each of the calculation

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results, so to speak.

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OK, so here what we said to the text.

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We can now just use this remove after dot and pass the calculation in there.

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So the result?

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So the string of the result in there as the parameter.

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OK, so remove after dot with this thing as a string.

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OK, and now we can do the same thing with the other calculations.

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So here we do the same thing.

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We just need to make sure that we replace it with the right operation.

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And here it has to be the plus and then here accordingly, the minus.

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OK.

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And.

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Was it the minus for this one?

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Yes, it was.

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OK, so now let me check because I believe I have this minus twice.

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OK, that's good to know.

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So let's use it instead here.

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Which creates a situation where this elusive would have been unnecessary.

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OK, let's run it again and 99 minus 66 and see, OK, we have only 33 now, not 30 3.0.

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All right.

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So that's pretty much it for this calculator.

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So you see, we have a proper calculator, we can clear the entry.

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Now, as you could, of course, have zero as the default value that is going to be displayed here if

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you wanted to.

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But overall, this is a calculator that works, at least for the basic operations.

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I hope you enjoyed this chapter in the next one.

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We're going to build an actually cool app because this was just to show you the fundamentals and really

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teach you how to use all of the good string stuff and the next chapter.

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We're actually going to build a cool quiz app, so see you there.