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Welcome back in this video, we are going to use if statements and we are going to finally make use

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of what we've learned so far, for example, the comparison operators, which are very useful when it

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comes to if statements.

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So we at this comparison operator, we said five, equal, equal three.

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And then if that was true, we can now go ahead and execute something.

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So now let's go ahead and create an if statement here.

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And before we do so, I'm going to create a little variable called height person one.

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And it's going to be something like 170.

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And then.

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Maybe I should be written correctly, and then I have another one height.

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Person two should be something like one hundred and.

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Eighty nine.

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All right, so these are centimeters.

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For those of you who aren't aware of what I'm talking about, so one hundred and seventy centimeters

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and one hundred eighty nine centimeters, I think that's something like five.

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Seven or five, eight or something like that.

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And then this should be, um, six three in terms of feet and inches.

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All right.

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So these are the two height person, height person one and height person two.

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So we have two people and we want to execute something based on a condition.

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So if person one is taller than person to.

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Then we're going to use raw force in order to beat it.

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Let's say we have a fight between two people and now we have to decide what kind of technique we want

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him to use.

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So let's say our fighter is 170 and the opponent is 189.

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So what shall we do?

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Shall we either use raw force or shall we use technique?

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Of course, a combination of both will be useful, but then we're going to check if height person one

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is greater than height.

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Person two, I simply want to print something like use raw force.

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All right, so let's say let's assume that if someone is taller than he's also going to be stronger

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because he's going to have more weight and that is going to be very useful in a one on one fight.

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But now.

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If we execute this line of Coke, we will see that pretty much nothing will happen because the condition

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isn't met, so we have this condition of hide person.

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One shall be created in high person two.

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But if you look at the values, we will see that that is not true because 170 isn't higher than 189.

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So we can see we get nothing here printed.

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So now let's say the other way around.

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What shall happen if I'd person one is less than high person two?

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Well, that's something that we can use with an else statement.

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OK.

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So in this case, it's either if or else.

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So if this condition is met, then execute the code that is within those curly brackets.

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And if the condition is not met, then run the else block, which means run the cult, which is within

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those curly brackets.

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So here I'm just going to say use technique.

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All right.

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So now let's run this again and see if anything will be printed whatsoever.

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And we can see it says use technique.

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So because our personal one was smaller than the other one, we advise him to use his best techniques

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instead of trying to apply real force when fighting one on one because we're one hell of a coach and

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want only the best for our fighter.

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But what shall happen if they are both the same size?

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So let's say we have the situation where both are actually the same size.

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Is there any special advice that we can give our fighter, even though in this example, it's rather

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weird to have such a situation?

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But let's just say we have this other.

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Condition.

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So what you can do is you can have an else, if so, there are three different types of checks.

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So the if check, then the elusive check.

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And then finally the LS, which is not really a check, but which is a code that will be executed as

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a default if none of the above are true.

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So what does that even mean?

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Well, let's say we have an LS if in between here.

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So me show you.

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So we have an else, if again, with a condition.

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So here I'm going to say that those two have the same height.

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So equal, equal.

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All right.

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So we had this first condition here, which was high person, one greater than hot person, too.

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Then we had the second condition here, which was high person.

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One is equal to high person two when it comes to his size, and then we can execute some code if that

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condition is met in here.

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So let's just say something like use your power technique one three three seven, something like that.

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So the fighter has this power technique, and it's very useful against people who are the same height

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as he is.

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So you should use that technique.

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But then we have this else block, which will be executed if none of the above are true.

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So if neither this if statement or this condition here is true nor this condition here is true, then

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else block will be executed.

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So then the text use technique will be executed instead.

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Now, the cool thing is you can have as many lives as you want, so we could go ahead and check if the

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height of person one is greater than 150 and execute some coat, then check if what what should happen

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if the person is smaller than 140 or all kinds of combinations that we can think of, even though we

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have to be careful that certain conditions don't overlap with each other because if they overlap, then

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one of them will be useless.

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OK, so what we have here, if we execute this, let's say when the person's more personal one in person

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two are both 170, then it should display use your power technique one three three seven.

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So that we are, it says use your power technique one three three seven.

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So let's say want the person to is smaller than the person one, then it should say use.

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Air Force.

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So that we are use your force.

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All right.

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And what you see here.

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So this whole, if elusive of stuff is a control flow and we're using if statements here now a little

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challenge for you.

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Please go ahead and create an if else, if else, if else block where the first age check will be at

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greater equal.

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21.

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And if that's the case, then it should write something like or print something like you may drink in

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the US, then LS.

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If the age is greater equal than 18, then you may vote.

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And if somebody is older than 16, you may drive.

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And then finally, if none of the above is true, then it should print something like you were too young.

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So try to use this kind of structure to print those different statements based on a variable called

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age that you, of course, also need to create.

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So go ahead and try that.

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All right.

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So I hope you pass the video, so I'm going to create this variable called H.

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And actually, I'm not going to change it so I could go ahead and use a vowel here.

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So the variable will be h and then I use an if statement here.

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If age was greater equal 21.

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Then I want to print something saying, now you may drink in the US because in other countries, you

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may drink before that, right?

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If you do that, then in our case, of course, this will not be printed because age is not greater

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than 21.

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Now let's have another check.

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So else, if the age is greater, equal.

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18.

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So what should be printed if that's the case?

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Well, let's print something like you may vote now.

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All right, Prindle, and you may vote no, and then we have another check.

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Age creator equal 16 And then in the US, you may drive so poor and Dylan, you may drive now.

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Of course, he knew the license for that, but at least you can make the license or do the license at

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this point and then you can use it.

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And then finally, we have an LS block, which will be executed if none of the above is true, which

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means if the person is.

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15 or younger than it should say something like?

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You're too young to do whatever.

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All right.

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So if we run this, you probably already guessed it, it will print.

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You may drive now because our age is 17.

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All right, so let's run this, and there we are.

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So it says you may drive now.

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Now, if the age is, let's say, 31 as I am.

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You can see it says now you may drink in the US.

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All right, so of course, I can do all of the others information as well, so I also may vote.

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I also may drive now and so forth.

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Of course, I could adjust the print statements here accordingly.

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But this is the latest thing, so to speak, that I can do due to my age.

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All right.

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So we have this, if else, if else blocked, that we can use in order to execute stuff when certain

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conditions are met.

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Now, by the way, a thing that you can also do if you have a very basic if statement.

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So let's say you only have one line of code that follows a condition, so age is greater equal.

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30.

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Then you can just go ahead and do or add the text in the next line, you're over 30.

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All right, so that's something that you can, of course, also do directly.

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So just one line of code without having these extra curly brackets around it.

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So if you see anything like that, that's what it does.

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But you have to be careful because in the next line.

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So if I add something like this in the next line?

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This line will not be part of this if statement, so it will be executed either way.

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So be careful here.

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All right.

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So these are the if statements and in the next video, we're going to look at when.

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Because you might see already that it's complaining.

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So it says Cascade, if should be replaced with when.

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So let's do that in the next video.

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So see you there.