All language subtitles for 021 More On While Loops__en

Welcome back.

Before we go to the for Loop, I wanted to show you another application of the wire loop because it

will make it a little more clear what the difference is and when to use what.

So, for example, the for loop is really there to iterate through rangers' arrays and so forth.

And we will see what that means in the next video.

But before we do so, we will have to look at while loops which are great to execute a block of code

repeatedly as long as a condition is met, as we saw earlier.

So let's have an example where we don't look at numbers because so far we only looked at numbers.

We said, OK, var X, as long as X is, why, then do something.

But now let's say we have the situation where we have a variable called felt temperature and that one

will be cold.

So let's say we are in the room and it feels like it's cold.

So we don't know directly what temperature it is in terms of degrees.

Right, in terms of degrees Celsius.

So we have also a value called room temperature, which actually is that value.

So let's say 10 degrees.

And.

Now we will run a wild loop, which will increase the temperature, the room temperature, by one degree

until it's warm enough so that temperature is not cold anymore.

So here we are just going to say, as long as fildes temp is cold.

Please run this while loop, which will, as I said, increase the room temperature.

So now, of course, we still need a situation where this condition is not met any more, so we need

to create this situation so we can check if the room temperature is greater or equal 20.

Then set the felt temperature too comfy, so too comfortable, so it's not going to be cold anymore

and also print something onto the console, parental and.

It's comfy now.

So now if we execute this.

It will just print its coffee now.

Why is that what happened in this whole thing?

Well, we set the temperature too cold because when it's 10 degrees Celsius, then it's pretty cold

and we don't want to be in the room when it's that cold.

Wanted to be 20 degrees Celsius.

Which is 60 degrees Fahrenheit.

All right, so what you say is as long as it's cold, please turn up the heat.

So increase the room temperature by one.

And as soon as the room temperature hits 20 degrees.

Then said the Feld's temperature too comfy.

So now in the room, we feel like, all right is comfy.

It's a good temperature.

We can maybe even get rid of our jacket and then we can print.

It's comfy now.

And our while loop will stop, so at that point, our while loop will not increase the room temperature

anymore and it will jump out of this whole loop and execute whatever comes afterwards.

So this is just another application where you see that it doesn't have to be an integer that we're checking

here, it can be whatever condition that has to be met.

And as soon as this condition is not met anymore, the wire loop will stop executing its block here,

its body.

It's called Block.