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So hello again and welcome back.

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This lesson is going to be a very quick wrap up of a few things that I think I still missed as I was

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going through the lessons.

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If you remember at the beginning of this section I told you that by the end of this section you should

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know almost everything that I'm doing.

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Any definition any declaration any specific target they didn't explain in the earlier lessons was supposed

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to be you know clear in this particular section.

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And as I was going through the lessons I realized there's still a few really quick stuff that I might

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have to explain them before we go to our upcoming sections.

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So with that in mind I'm going to go ahead into ex-cult and I should mention that while while I was

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in order coding the last lesson on this one I have between these two I have updated my export I'm using

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export 10 the CD version not the any of the Beatle versions so that doesn't really make a difference

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in what we are doing but you might notice some visual you know differences.

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In any case I'm going to make in your OP the wrath of swift and in Rap-Up see if I want to explain essentially

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a few different things.

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One of them is the difference between a float and a double.

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The other thing that I want to talk about is marking your application and that's essentially making

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the regions.

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And finally I want to talk about NSA numbers which is essentially a subclass of an that's of value.

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So let's go ahead and quickly have a look at those.

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The difference between a float and a double if it doesn't come up somewhere in the lesson so far is

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that float is tilted to a floating number two that were spaces and double is 64.

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So essentially double provides more numbers and more precision I could do a quick test for you saying

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let my float.

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Let's make that a float value of 1 divided by three fewer than one divide by three essentially becomes

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point 3 3 3 3 3 3.

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And in mathematics it becomes point 3 3 forever.

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In computers we have to eventually at some point stop that Wedel the same thing.

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I'm going to call this one my double.

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And that becomes the double of the same thing.

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Let's go ahead and princedom.

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So I'm going to say print float is the one that is going to be my float on under the cockpit not on

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in here.

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I'm going to say double is I don't want to put my up in the print file.

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So let's go ahead and run this project for application.

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This is one of the defense says they're visual things in the new ex-coach essentially shows you the

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region you have caused changes since the last save.

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So in any way any case float is now point or three up to like you know eight places I guess and double

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it's going to be a lot longer.

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And that's essentially for when you need more accuracy with your numbers.

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I usually get away with just using float values because you know that's.

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It does happen occasionally but not very often.

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I need a double value.

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The next thing is using a..

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Number and this number is essentially every four encapsulates a value of the type integer flawed or

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or bully and even are assigned value into another entity which offers us a raise for formatting values

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and ways for using the value of that time to communicate that value with backbends or different places

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and this number is a subclass of an asset value like dimension and values and a value for maintaining

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things such as a struct or things such as C.G. points or CGI Rexes or all things that you're going to

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see in writing.

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Our next section.

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But for here all I want to do is I want to use this number two to formats my double in two different

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ways of showing it.

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I don't want to see it the decimal points.

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Maybe I want to see it in a scientific method or other ways.

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So to do that I'm going to go ahead and say let's use a large double and I'm going to say large double

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is my number one deployed by one through the power of so many many many numbers.

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A very very large value.

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So the next thing is I'm going to say Let my and this number and what I'm going to make to become any

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number of the value and the value is this one the very large one.

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And now this.

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And this number allows me to do things such as formatting them.

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So for instance I could go ahead and say my form either form or other it becomes a number for my other

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and I'm going to go ahead and say my form either god number or style is going to be number four.

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Neither does the style dots.

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And we could look at different ways of showing Clancey showing give the decimal ordinal roll values

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or like scientific and religious scientific for now and then they could say I could say Let let's call

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it the result value and this is going to be a string.

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I'm going to say that's going to be my form are there not a string of.

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And a number and that is my answer.

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Number two is essentially saying get the number that is produced of a large double called my larger

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number get the number of IT COME both into a string using a format there that converts values into a

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scientific style.

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Put it in the reservoir.

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And of course they could go ahead and say preens rez is Reds land and not this holiday.

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It's there is and we get that warning is obviously because it has value is optional.

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And I think optional 3.3 retreat is the power of 10.

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And if I wanted I could simply go ahead and say it's an unwrapped optional so that thing doesn't happen

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anymore.

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So I can run it for more time.

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And now we will see three point three.

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The power of 10 and that's a scientific way of showing this number.

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Let's try another one let's say your style I want is let's say currency.

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I honestly don't know what's the difference between crying and saying crunchie accounting so we can

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try both of them.

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So currency is going to be separated by every tear.

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The number I'm guessing yes is going to be dollars 9:33 I guess.

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Billion 333.

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So on and so forth.

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And there's another one currency Konting Let's see what's the difference between this one and one.

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So depending on the sign that you might need you could use any of those up.

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Now with that in mind the last thing was marking or regions.

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So a lot of times in your court.

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And that is in just one single file.

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You want to be able to separate your code into separate pieces for instance.

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I have a region up there that is my variable declarations and then I have another region which is my

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delegates.

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And then when I have another region which is I don't know my method definitions.

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So for each of these we essentially introduce a new region on industry if we do it it's my comments

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Mark or capital letters.

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And then in front of the market you're right.

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I don't know valuables it's not the moment they do this up here in the selections I could actually see

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it showing up that you know if I'm here at the bottom of my court and I both too valuable it pushes

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me up they're there to put different types of marks as well.

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One of them is called the Mark sorry it's called to do.

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And that's essentially something you have to do in here.

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That's essentially making your way for you to know that these are the things that you still have to

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implement.

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So could go ahead on that one and there's another one called The Fix me which is essentially something

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that has gone wrong.

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You can write yourself.

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I don't know let's put this at the bottom of the code so here.

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And if I go to selection's I say overawing there is something you have to fix in here.

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It's a very good way of organizing your call and then reminding yourself of things that are coming up

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just like how you use comments simply for reading different things and knowing what's going on and you

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could use Mark to do and fix me to a specifically you know look for something that you want to do if

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you want to use these in Objective C it's a little bit different.

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It's called tracking you more March and that's how we essentially make different regions even in Objective-C.

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But I'm guessing that for the most part you guys will be doing Strief from now on.

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So our difference between float and double are using a number on using regions with daddy in mind.

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Let's move on.