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Oh yes and welcome back to another class of our course about Python.

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So in our last class we practiced a little bit what we have just learned.

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Until now in this class we are going to do the same thing.

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So we will create another Python up this time a bit more complicated but just using the notions that

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we learn until now.

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So we are not going to add nothing new.

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We're just going to use the notions that we learned until now.

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So it's gonna be very cool.

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My goal today.

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Well the objective of this new app that we are going to do today is very simple.

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So we will have three persons which will have each of them will have a name.

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Those three persons will buy a pizza and we want to know how many slices each person eighth of the pizza.

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And depending of the number of slice that each person eight will give a will.

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Find out how much each person will pay.

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So we'll write down the code for all this and we will go step by step.

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I'll explain you how all this.

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Well how all this will work.

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So let's start.

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So the first thing I'll ask you guys to do is like always open up your text editor and going to your

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project one.

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So like you said the first thing that we want in this app is our user to give us his name his or her

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name depending if it's a girl or a boy.

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So we'll ask him.

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We'll ask him to enter his name.

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So we'll simply enter name one in this case and one what we want.

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As I said we want the user to give us his name so we'll write down input.

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That's the function that will allow us to ask the user for his name.

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So in this case we ask the user for some things or write down input and the user will simply give us

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his name.

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So you write down and so input open up your very brand theses and ask the user what is your name.

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That's very simple.

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We did this for our first user.

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So we will simply copy everything and pass them so we have.

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Name one name to name three as I said we have three users.

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So very simple.

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We simply copy and paste everything.

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All right.

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So this is for our well the first data that we need to collect our names.

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So in this case we have strings.

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And the next thing that we want as I explained we want to know if we want to find out how many slices

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each person eight we need to find out at first.

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How many slices the pizza have.

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So what we will ask our user is how many slices the pizza have.

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So we can write down slices in the pizza.

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So once again we ask our user How many slices is there in the pizza.

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Let's not forget your input function and you ask your user How many slices in the pizza.

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All right.

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So right now that we know the number of slices in the pizza.

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We want to know what is the price paid for the whole pizza.

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So what is the price paid for all the pizza.

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So in this case if the pizza cost ten dollars and one user eat only one slice of well if the pizza cost

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ten dollars and there is ten slices and the first user only eight one slice this means the first user

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will have to pay one dollar so we'll do it this way.

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So as I said the next question is what is the price of the pizza.

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So we have no slice.

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We have the price.

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So once again simply write don't input and we ask our user what is the price of the pizza.

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Great.

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So we have our first data right here we have the names we know will we know how many slices there is

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in the pizza we know what is the total price of the pizza what we need to know right now is how much

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each person eat.

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So in the first case how much of the pizza of the whole pizza the first person eight.

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So let's say the first person eight 50 percent of the whole pizza will ask the person how many how many

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parts or how many.

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Let's say what percentage of the pizza have you eat.

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So once again we need to put this into our code.

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So how we'll write it down is very simple.

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I will write down percentage

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8 by

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person 1

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so in this case we have our variable percentage aid by person 1.

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We can name it like this if you want to make something shorter.

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Well you can ask once again to ask our user what percentage he ate from the pizza.

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So write them so will once again write down input.

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So we will use our variable name one as a reference because we are talking to the name one so the first

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user in this case we are talking to this person.

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So we'll write down name one and we'll ask this person what part of the pizza.

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What percentage sorry.

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What percentage of the pizza do you have.

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So once again why I use the this variable right here as I explained when we'll print everything and

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went Well when we won we will ask our question to this person to the person that I have named one one

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a name this person so want to ask this person.

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So to ask this person and to know her name or his name we need to refer to name one.

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So in this case this variable we need to refer to this variable so we do this for the person number

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one.

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The next thing that we need to do we do the exact same thing for the person number two and the person

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number three.

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So you can simply copy and paste everything and when it's all done you simply change the variables so

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well the variables the numbers.

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So in this case we have Person 1 here we'll have person 2 here will have a century.

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Same thing for the names.

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So we have named number two.

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Name number two.

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So I hope you follow until now and you understand what we are doing.

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So let me just summarize what we did until now.

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Since it's not done we named our so we have our first variable which is name 1 2 3.

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We named our users.

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After that we find out find out the total number of slices and the pizza.

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The price of the pizza.

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And right now we are looking at how many.

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What percentage of the pizza.

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Each person.

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8.

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So very simple.

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That's the data that the people will have to give us.

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So we will be able to calculate everything good so we have all the data that we need.

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Now we need to make the calculation to be able to answer to our questions.

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In this case we want.

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What are the questions that we want to answer to.

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The first one will be how many.

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Well how many slices the each person have.

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Eight.

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And the second question is what price each person paid for the pizza.

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So to find out.

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So we'll write down a number of slices

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this will be the first thing that we will look for a bi person.

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So this will be our variable that we will use so the calculation to find out the number of slices by

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the first person is very simple.

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We simply multiply the percentage of the pizza that the person have 8.

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So in this case of the person have a 50 percent of the pizza will multiply 50 percent by the number

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of slices there is in the pizza.

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So in this case if there is 20 slices in the person 8 50 percent of the pizza we will have the person

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number one will have 8 10 slices.

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So it's very simple.

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So how do we calculate this.

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We want to multiply right here the percentage 8 by person number one by the number of slices but very

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important since all all the data is stored in strings.

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The first thing we have to do is to transform this data into numbers to be able to make the calculations

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so we will use the float function for this.

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If you guys remember so the float function is really used to transform strings and strings into numbers

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and the function.

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The function SDR is used to transform numbers into strings because we can't work with strings and numbers

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at the assembly so both data will not work together.

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So write down float and simply go and look for our first viable which is percentage 8 by person number

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1.

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So here we go.

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We have this and the calculation will be percentage 8 by person number 1 multiplied by once again float

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because we want to transform our slices in the pizza into a number.

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Right now it's a string so we'll write down float and we'll write down slices in the pizza.

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So this is our first calculation that we want to do.

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So this calculation will help us find out the number of slices that the person number one have 8.

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So when we have this we need to find out the same thing for the person number two as well as the person

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number three.

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So simply copy and best everything and then you can just change the data.

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So we have a number of slices made by person number 2 and person number 2.

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So you can just change the numbers the slices in the pizza stay the same like always.

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So when it's all done right now we have the calculation that will help us find out the number of slices

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that each person eat.

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The next question that we will ask ourselves is what is the price paid for by each person.

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So in this case let's say each person have.

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If a person have a 10 slices of a pizza 20 slices and the price of the pizza is 20 dollars.

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Well the person will need to pay ten dollars because each slice costs one dollar so there is more than

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one way to find out this answer.

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But the way that we are going to use will simply multiply.

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The price of the pizza and the percentage of the pizza 8 by the person number one by the price of the

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pizza.

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If the person number one have a 50 percent of the pizza person no one will pay 50 percent of the price.

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So how do we do this.

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Very simple will create another variable that we will name price paid by let's say number one.

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So in this case.

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Name one.

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Let's say name one price paid by name one and we write down this.

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So as I said the calculation will be the percentage of the pizza.

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8 by person number one by the price of the pizza multiplied by the price of the pizza.

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So once again we'll use our float function and we'll simply multiply.

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As I said percentage.

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So in this case we will calculate will refer to the variable percentage aid by person 1.

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And all this multiplied by once again the float function.

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The price of the pizza as you can see this is the calculation.

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So this calculation will help us find the price paid by the person number one so when it's all done

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it's very simple.

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We simply come back here and we copy and fast everything

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and then the next thing that we will have to do is just change the numbers.

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So in this case we just changed the number the name one by name two.

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And same thing for the percentage eight by each person as you can see it refers to this percentage end

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to this percentage as well.

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All right.

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So right now we have all the calculation that we need for our app to work.

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So the next thing that we will need to do is print everything.

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So what exactly the person will have as an output.

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So those are our inputs.

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This is the inputs.

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That's what we ask from the person.

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This is what the app will do like calculation.

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So those are the that's the calculation part.

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That's the first part.

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That's the second part.

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And the last thing is what will be the output of all this.

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So very simple.

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What we will print will be the person number one have eight a certain number of slices and have paid

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a certain price for his meal or her meal.

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So let's write it down.

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So name number one in this case have eight.

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So you open up your small commas and write don't have eight so forget to add spaces because in the other

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case you'll see it's not gonna be very very beautiful.

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Then the next thing we'll have eight number of slices.

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So the number of slice in this case is a number so we need to transform this number into a string.

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If we want our app to work so simply write down s t r so the function SDR and we ask for the number

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of slices a by person number one.

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So as you can see that name so the person number one this case have eight a certain number of slices

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then we'll continue our function a function our output

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so I have eight this number of slices and have paid have paid how much.

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So in this case we'll do the exact same thing.

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We'll return the string of the price paid by the person number one so we'll go and look for the variable

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price paid by name one and we'll continue dollars for his meal.

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All right so let's put everything together.

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Let's the critics eat everything.

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So what is our output in this case.

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The output says name number one.

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So this variable which will be our first name have eight.

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This will be the number of slices and the person number one have eight.

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So we need this answer and have paid.

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Right now we have our second half paid.

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This is the price that the person have paid.

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So in this case we'll return this variable right here and this is just string.

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So this is just text dollars for his meal.

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So as I said very important don't forget to add spaces because in the other case it's not gonna be very

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beautiful to look at

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all right.

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So until now we have everything that we need.

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We have the output for the person number one so what we need to do right now we need to write the same

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output for the person number two and the person number three.

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So how we will do this how we always do.

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I will simply copy and paste everything in the next sentence in the next line of code.

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So a simple simply select everything that you have here and you passed it on the lower line of code.

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All right.

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So when it is done simply change the numbers.

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So in this case and they will be named to end name treat and the number of slices eight by each person

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in this case person number two person number three.

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Same thing for the price paid for each person by each person sorry Here we go.

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So right now we have the whole code completed for our app.

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Let's run everything and see what it all looks like.

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So in this case if you want to run everything simply click on the run.

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So the app ask us What's your name.

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In this case let's say it's Mark.

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So name or no one will be Mark.

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Name number two will be.

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Let's just fix one little thing before we continue so just add two points so it will be more beautiful

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when you write down the names once again.

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It's not an obligation if you just want to run the app right now.

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You can run it.

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It will still work but just to make it more beautiful you can add the two points.

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All right great.

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Let's run the app once again.

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Good.

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So what did it.

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What is your name once again.

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As I said it's Mark the same name let's say it's going to be John and the last name will be let's say

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I don't know a little.

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Here we go.

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How many slices in the pizza so let's say the piece that we had 15 slices let's say 16.

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What is the price of the pizza in this case let's say the pizza have custard for you dollars what percentage

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of the pizza you have eight.

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So in this case Mark we forgot to add a a space.

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So once again as you can see it's not beautiful when you don't add a space we can just add spaces.

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So it's not a big deal.

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The Apple Store.

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So what percentage of the pizza you have.

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So Mark have a 50 percent.

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So we'll not write down 50 percent like this.

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We'll write down 50 percent like this zero point five this week by 10.

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We'll be able to calculate everything John.

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What percentage of the pizza have you 8.

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So John have a twenty five percent so we'll write down zero point twenty five.

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And Eileen what percentage of the pizza have you eat.

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We'll write down zero point twenty five.

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So once again twenty five percent then we'll simply click on enter.

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And as you can see this is our output.

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So Mark have eight eight slices and have paid twenty dollars for his meal.

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John have a four slices and have paid ten dollars for his meal and I have a four slices and have paid

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ten dollars for her meal.

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In this case her meal.

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So as you can see the app works perfectly everything is amazing.

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If you want to make it more perfect and you want to change some things you can just play with the text

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maybe.

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For example right here in this place Mark instead of as you can see it's it's well it's together what

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you can do is simply add some spaces.

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So it just a question of spaces and you'll see everything will be more beautiful and more presentable.

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Same thing for example right here when you guys.

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Well that's it.

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That's nice.

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Oh yeah.

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That's it.

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Right here for example Alan since it's a girl you can write down for his her.

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So let me just show you the radar right.

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I don't like this or his or her view and that's it.

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So the app will still solve right now the upper it's perfectly the only little fixes that you can do

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well I just told you we can do as a fix.

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So right now guys we just put everything together.

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What we have learned into practice so I hope you like the course so far so as you can see programming

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in Python is not that hard.

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So we created a code that is a bit more complex but just with the things that we learn until now no

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new functions.

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Right.

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So that's it for this class guys in C all in our next class.