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Computer Science Videos 112 videos

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AP Computer Science 1.2 Review of the Basics 207 Views


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Description:

AP Computer Science: Review of the Basics Drill 1, Problem 2. Which of the following control methods are used in this program?

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English Language

Transcript

00:00

Thank you We sneak And here's your smarts You sure

00:06

hated here there's A fibonacci sequence app it's loaded with

00:09

ads All right Which of the following control methods are

00:13

used in this program Conditional control it Oration incursion All

00:18

right And here your potential answers Okay Ready Okay It

00:23

sounds like we're being asked about our understanding of a

00:25

few key concepts namely conditional control it oration and rijker

00:29

asian let's start by going back over rick Urgent get

00:32

it Incursion is one way of implementing a looping mechanism

00:37

And you're probably already familiar with the basic idea In

00:40

another setting The fibonacci sequence will calculating the fibonacci sequence

00:44

by hand is pretty simple Start with one and one

00:47

and calculate the next number by adding the two that

00:49

came before it doing such a thing in job it

00:51

would look a bit like this This fibonacci method takes

00:54

an imager as its parameter and returns the number at

00:58

that position in the fibonacci sequence calling fibonacci eleven would

01:03

end up returning eighty nine for example where we got

01:06

that we do out man and here's the magic bit

01:08

that makes this a recursive algorithm If are given imager

01:11

is greater than the one we're given the some of

01:13

the previous vivan aci integer and the one before it

01:17

but to calculate those values the method must call itself

01:21

However if the imager is one or zero it returns

01:24

those values respectively Those air are based cases to keep

01:27

our method from becoming infinite It's a lot like that

01:30

movie inception except that were actually able to figure out

01:33

how the ending works The code snippet given by the

01:36

question doesn't feature any riker jh in though there's also

01:39

the concept of conditional controls which is to say if

01:42

statements none of those here what about federation Oh you

01:46

betcha Four loops while lips and do wild loops are

01:49

federation statements in java and they worked by wealth iterating

01:53

innit aerator and it aerator is just an imager that

01:56

ticks upward or downward Each time a loop cycles this

01:59

poorly it creates an iterated called i will stop running

02:02

when i reaches ten and increment i by one each

02:05

time the loop cycle that's exactly what's happening in our

02:08

question snip it your answer is to uh no it's 00:02:15.947 --> [endTime] definitely B

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