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AP Computer Science A Videos 108 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?
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
Full Transcript
- 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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