All language subtitles for 014 [Interactive Coding Exercise] Variables_en

All right guys, it's time for your final coding exercise.

So click on day 1.4 variables.

Now the aim of the game is to switch the values of these two variables around.

So if we go ahead and run our code as it is,

it's going to ask us for a value of a. Let's call it five.

And then it's going to ask us a value for b. Let's call that a hundred.

And then when I hit enter,

what you want the code to do is to go ahead and print a equals 100 and b equals

five.

So, basically switch those values around. And you're going to have to write your

code in here. And it's really,

really important that you don't change any of the code here or the code here.

Now it's easy enough to simply just write print a equals b and b equals a.

But this doesn't test you on anything. This is not the solution.

This is wrong. Don't change the code here, don't change the code here.

Instead, all

you have are these lines where you can write as much code or as little code as

you need to achieve this end. And when you achieve it,

it should look something like this.

You type a value for a, you type a value for b. And when you hit enter,

they get printed out,

but switched around. Have a think about how variables work,

how they store data. And if you get really stuck,

imagine that you have two cups; one holds a cup of milk, one

holds a cup of coffee,

and you wanna switch the contents of the cup around. How would you do that in

real life? And then try and see if you can apply that logic to the code.

Pause the video now and give this a go.

All right. So I hope you didn't cheat

and instead you actually had a think about this problem. If you got stuck,

remember how I said

if you have a cup of coffee and you have a cup of milk and you wanna switch the

contents of the cups around, how would you do this in real life? Well,

you would probably get a third cup, right?

And then you'd be able to shift the contents around.

So that's exactly what we're going to do with our code as well.

We can create a new variable called c and we can set that to equal the value that's

stored inside a. And then later on,

we can get the variable a to store the value that's currently inside b.

And finally,

we're now ready to get b to store the value that was previously inside a,

which is now contained inside the variable c. These three lines achieve this

little switch rule that we've got here.

And this is one of the most common Programming interview questions that you will

come across. And the code is super simple,

but what you have to apply here is some logic.

And I usually think about real life examples

like the cups and I hope that helped you as well.

If this was at all confusing,

then have a go at trying this out in Thonny.

But if you got it right, then congratulations.

This was actually quite a hard challenge.

You had to think about a lot of things and think outside the box as well.

So give yourself a pat on the back if you've got it right.

If you didn't get it right,

then I really recommend to put this code inside Thonny and see how it's being

moved around so that you really,

really understand what's going on behind the scenes.

And then you can move on to the next lesson where we're going to talk about some

of the rules around naming variables. For all of that

and more, I'll see you there.