Original subtitles

So when will we want to use conditions in what situations?

Think, for example, that we would like to develop a program that will get your grade on your last

exam?

And suppose you would like to make this program a really cool one.

Such a program that will preened congratulations.

Message to the screen.

If you've actually passed the exam.

But if you didn't pass, meaning that their input rate was insufficient, let's go this way.

You will print a failed try again message.

And I would like you to take a couple of minutes to just think of this question.

Could you accomplish it?

Do you think you can write the code for it?

I mean, right now.

So give it a shot.

Would you?

And once you're back.

Basically what we can see here on the screen is that we have two different programs on the left and

on the right side.

And both of these programs read the input from the user.

And then one of these programs preens congratulations, message to the screen while the other one preens

failed.

Try again, message.

But if you take a look at them separately, they are not so useful.

Right.

That's why we should aim to combine them into just one program.

So we will take the failed DRÉ again message and just move it to the left.

Just added to this program.

And now we have both of these messages just in one place.

But this probably you can see, unfortunately, if we tried to run these program as is.

You will simply see that you're getting an input from the user, which works fine.

And then you just print congratulations as well as failed.

Try again, message.

And that doesn't make any sense, though, to print both of these messages, one after the other.

So, guys, that's exactly why we need some control here in this control is actually something new.

We haven't used it in previous sections.

We didn't see any examples in which we were testing any conditions.

All we were just doing is simply running some lines of code, getting inputs and giving output commands

one after the other.

So how should we add these controlled while program?

And it basically should work like this in both situations.

We will still need to read some inputs.

Right.

So these parties, these a must.

And it has nothing to do with any condition.

And now comes the real question.

How will you print congratulations if they received grade equals or higher than, let's say, 60 and

print a field, try again.

Message if they received rate is below is lower than 60.

So for that, we will need to ask the help of these guy who will be in charge of all the control flow

in our program.

He will decide on what path should we take next based on the result of some condition.

So basically great equals or a higher than 60.

Meaning that the result of this condition is true.

Then we will run the code on the left side and print congratulations message to the screen.

And be very happy about it.

But if the result of the condition is false, we will run the code on the right side and print a failed

try again message and be very, I don't know, unhappy about that, that we failed the test.

So basically all this guy does is simply deciding what parts of code.

What specific commands should be executed based on the result of the given condition.

In this case, it's just if a grade is equals or higher than 60.

So once again, just to make that clear.

If the grade is higher or equals to 60, then we will run the code on the left and print a congratulations

message to the screen.

Otherwise, if the grade is not enough to pass the exam, we will run the code on the right and print

a field.

Try again message.

So now we simply do not print both of the messages as we've done it previously.

We are just executing the relevant part of the code based on the result of this condition.

So this is it for these video guys.

And I really hope that by taking a look at these previous simple example, you've got the point and

the reason why we need to use condition and control flow.

And now let's see how we can take this example and implemented in our programming language.

So I'll see you in the next video.