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Hello and welcome back.

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In this video, I will show you how to analyze this call and solve it.

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In the previous lesson, we have already determined that.

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The.

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Streamlined with a strict the length of the passport which you keep in.

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So the light variable, which for the remaining two stars, the length of the of which you kicked in

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in in this line, he compares whether it is less than five.

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So if your passport length is less than five, he will show the message.

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We never use a password that short.

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And that is what happened in this example when the a password length of only three characters each.

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This message.

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That suggests that the password is five characters or more, and so in this next session here, we tried

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the password, which is more than five characters.

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This time, he got a different message.

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So.

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He went on into the air spot and did some checking.

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And this time when he checked your password, he was checking to see whether the first character after

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password begins the letter H and whether the fifth character of the password begins with the letter

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you.

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So this is the first character.

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This is the first character of the password, and this is the fifth character after password.

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Let me explain how it works using not pay.

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When you enter your password, it will be stored in Hungwe.

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One.

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Assuming the opportunities aye, aye, aye, aye, aye.

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The first character on the Facebook, he's outby one zero.

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Let me use a different password.

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Let's say you have entered ABC and he saw the first character of the password is a character, a the

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second character of the password is actually one one, which is B, the third character of the password

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is ugly one two, which is C.

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The fourth character of the password is Upwey.

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One and three.

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Which is De.

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And.

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The fifth character of the password is actually one four, which is E!

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This is the notation in C language for two dimensional array, a two dimensional array is just an array

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of strings.

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So the first string is actually zero, which is the name of the program, which is C two.

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So actually zero is the name of the program itself.

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Itself.

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That is how it works and to make it complete, I would just like to.

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So in this correct me actually, two, because it has two parameters, C2 and the string for your password.

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And then in the string itself, there is.

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Two strings, the name of the program is the first three, which is ArcView zero, and it is C to this

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case, whilst the second parameter, the second string is the one which is a password you key in in

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this case, an example of be ABC, assuming that's assuming you had you had type A, B, C, D, E.

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So this is the meaning.

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Well, Occy.

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And we saw in this case in line 15, after he has confirmed that you have quién password of at least

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five characters, he went on to check whether your first character is Hajj.

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But notice here, he doesn't use the one zero.

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Huckabee, one zero is supposed to refer to the first character.

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Instead, he uses a stye front.

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It is actually the same thing, so another way to refer to the first character of a string is to use

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Estyn front harkavy one.

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So this also refers to the first character on the string is the same thing.

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Then this is the logical end operator in means that move this condition and also the second condition

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must be true before the whole expression is true.

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So the first character must be H and the fifth character must be you.

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So for here.

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Refers to the fifth character.

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Not the fourth character, why?

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Because in C a race.

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The first element of the array begins with zero.

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So the fifth element will be for so the first character of the string is element zero, whilst the fifth

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element of the string is element for.

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So this suggests that it is trying to check whether your password that you enter has hit you and you

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in the first character and fifth character, so the password should be any password with the first character

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each and the fifth character you.

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So you can type in any kind of password, for example, five characters, along with the first character

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age, the second character can be anything you want.

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By the fifth character, must be a new.

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So this is the password, let us check to confirm that is correct.

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So we are going to you now.

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Each has a first character followed by.

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And the fifth character we are going to put you into and we get a message saying it is correct, maybe

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we should pay attention to more characters.

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So this train is coming from here.

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So if you had entered the correct password that satisfies the length of at least five characters and

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also the first character must be H 55 character, you then this condition is met and you put the string

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correct.

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Maybe you should pay attention to Margaritis.

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So this is how we analyze and reverse and analyze, correct me, in Guéra.

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I hope this was easy to understand, and that's all for this video.

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Thank you for watching.