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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?

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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

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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