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All right, guys, are you ready for another challenge? In this challenge,

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you are going to be building a Pizza Order program.

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So we're going to ask the user what size pizza they want, small, medium,

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or large, whether if they want to add pepperoni to it and whether

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if they want extra cheese.

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So based on the user's input for each of these variables, and the inputs going to

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come in the form of a single capital letter, S, M, or L, Y or N.

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Based on their input,

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we're going to try and figure out what the final bill is going to come to.

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And you can take a look at the prices over here.

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So, if you want to add pepperoni for a small pizza, it's a $2, medium,

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or large pizza is $3, and an extra cheese is $1 for any size.

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So you're going to use what you've learned about multiple if statements,

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as well as everything from previously in order to be able to create this so that

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if the user types in, for example, this input,

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large, pepperoni with no extra cheese, then it should print out

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Your final bill is $28. Have a look at the examples and the hints

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and go ahead and solve this coding challenge.

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All right,

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so this one shouldn't be too hard and we're going to start off by creating our

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first if statement where we're going to check out what is the size of the pizza

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that they chose so we can assign the price to that pizza.

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If the size is equal to S, that means they ordered a small pizza,

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well in this case, the price should be $15, right? Now,

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we're going to create a variable up here before the if statement so that we can

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keep track of the bill.

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So size S, the bill is going to be increased by $15.

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Now you can, of course, simply just set the bill to $15 in this case,

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but because we've got a lot of things that can change the bill,

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it's easier to simply just add 15 to what it is currently using the plus equal

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sign that you learned about.

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Then we're going to check with an elif. Elif

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the size is equal to M, so if they chose a medium pizza instead,

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then the bill is going to increase by $20 instead.

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And finally, for all other cases, namely,

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if they'd got a large size pizza,

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then we're going to increase the bill by, um,

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$25. Now,

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notice how here you could have also used an elif and said elif size equal

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to L, um, well, in that case,

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the bill increases by $25 and you don't actually need an else statement.

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It's not required.

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If you feel like it's easier to read like this, small,

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medium, large, and what should happen for each case,

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then you can just leave it like this. But of course,

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there is an argument to be made that the user might have typed something wrong,

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right? They might've typed a lowercase letter,

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they might've typed a completely different letter. So in future lessons,

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we're going to show you how you can catch these cases and how you can deal with

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it. But for now, let's just keep our program as simple as possible.

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If they type the wrong letter, instead of S, M, or L,

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then we're just going to overcharge them.

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So now that we've established what the basic price for their pizza is,

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we're going to look through the ad-ons.

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We're going to see if they said they wanted to add pepperoni.

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So if add pepperoni is equal to Y, well,

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in that case,

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we're going to need to check if they have a small pizza or a medium,

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or large pizza, 'cause the price is different.

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So we're going to have a nested, if function in here.

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We're going to say if add pepperoni is equal to Y,

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and then if the size is equal to S, well,

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in this case, we're only going to add, um, $2 to the bill.

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But if the size was any other size, basically medium or large,

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so we can catch that using just an L statement

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instead of creating three separate, if sizes S, if sizes M, et cetera.

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And in this case, we're going to add $3 to the bill.

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So now we've got this case covered.

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The final thing is whether if they said they wanted extra cheese or not.

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So if they did, in fact, want extra cheese,

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well,

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in that case, all we have to do is just add $1 to the bill.

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So these are three separate sets of if statements;

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this one, this one, and this one.

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And by the end of all of these if statements,

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as long as we're at the right indentation level

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namely right next to the gutter here,

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then we can go ahead and calculate their bill and print it out for them.

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So we can say print,

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and I'm going to use an f-string to insert the bill in here, print

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Your final bill is,

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and then I'm going to add a dollar sign, and then inside the curly braces,

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I'm going to put it in the current value of the bill after all of these

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calculations. So did you manage to get it right?

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Did you manage to use a combination of if statements and elif statements,

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um, nested if statements, or did you do it in a different way?

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And it's totally cool if you did. As long as it does what it's supposed to do,

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then it doesn't really matter whichever format of your code

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you decide to go for it. And as a matter of fact,

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there's loads of ways that you could have written this code to get this

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functionality. Some of them will be slightly more readable,

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some of them will be slightly less readable.

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So, it's a case of you making a good judgment on that and choosing the code that

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makes the most sense to you. Now in the next lesson,

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I want to talk a little bit about combining different conditions so that we can

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use something called a logical operator to check for multiple conditions in the

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same line of code. So, for all of that and more, I'll see you on the next lesson,