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AP Computer Science Videos 110 videos
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AP Computer Science 3.5 Standard Data Structures 176 Views
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Description:
AP Computer Science: Standard Data Structures Drill 3, Problem 5. The resulting array from this code snippet has which of the following shapes?
Transcript
- 00:00
Sorry And here's your smug du jour Brought to you
- 00:05
by the multi dimensional array It sounds like a device
- 00:08
used to travel across the universe But it's just a
- 00:10
computer science thing that'll make you wish a meteorite would
- 00:13
fall on your face All right The resulting array from
Full Transcript
- 00:16
this code snippet has which of the following shapes And
- 00:20
here your potential answers Where rectangles circles Okay here we
- 00:25
go Nothing pushes a person's brain to the breaking point
- 00:28
Quite like the street magic of rubik's cubes and multidimensional
- 00:32
raised well looks like this code uses the first two
- 00:35
lines to create a two dimensional array of length ten
- 00:38
and twelve hollywood squares on mars Then a loop is
- 00:41
created and something gets added each cycle Well well look
- 00:45
at that lube or in depth in a second But
- 00:47
let's take a moment to see if we can knock
- 00:49
out some potential answers based on that information alone Option
- 00:52
a says the resulting array would look like a square
- 00:56
being that we've created two arrays with length of ten
- 00:58
and twelve there's No way it's going to be a
- 01:00
perfect square option B says we're creating a rectangle Well
- 01:03
maybe We'll hang on to be for now a better
- 01:05
shot he says we'll be creating a circle Well that
- 01:08
doesn't seem very likely because the four loop only increases
- 01:11
some factor in value probably widening the shape forever We'll
- 01:15
see that second circle It obviously need to come back
- 01:18
down to zero toe Drop the second half All right
- 01:20
let's put sea into the no pile All right d
- 01:23
a triangle Well totally possible If the shape is increasing
- 01:27
in size with every generation that loop things might end
- 01:29
up looking like a right triangle Thank you paige Rhys
- 01:33
We'll need to walk through the code To be sure
- 01:35
though e none of the above Well let's find out
- 01:37
Okay we've got our two dimensional array called multi with
- 01:41
length of ten and twelve Then loop begins with the
- 01:43
generator i at zero and runs until eyes no longer
- 01:47
lessen the length of the multi array which is ten
- 01:49
At least in terms of the first given dimension From
- 01:52
that we can predict the code within louisville Run ten
- 01:55
times One's inside It'll take the multi raise second mention
- 01:58
it Whatever I currently and zero on the first cycle
- 02:01
and create a new imager at the position of zero
- 02:04
plus one no one Then it'll cycle again with i
- 02:08
increased by one and again and again and again we
- 02:10
could keep going but it looks like we're just getting
- 02:12
a right triangle just to double check Let's open our
- 02:15
interpreter and add this line to loop so we can
- 02:18
visualize what's being constructed system out print line a raise
- 02:22
to string multi eye all right that'll print to the
- 02:26
console in string form Whatever the content of multi at
- 02:29
the eye dimension is and you're goes and yep that's
- 02:32
pretty triangle e and a right triangle e is that
- 02:36
the ideas are answer and we didn't even have to
- 02:38
try Is that hard Hi sorry we'll try to do 00:02:42.11 --> [endTime] better He's going forward there yeah
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