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AP Computer Science 4.3 Review of the Basics 187 Views


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Description:

APCS: Review of the Basics Drill 4, Problem 3. Which of the following correctly constructs the string ShmOOP?

Language:
English Language

Transcript

00:00

Thank you We sneak And here's your shmoop du jour

00:05

brought to you by the schlep Sue sub stringer eight

00:08

thousand It slices trims fillets chops cuts stabs folks scratches

00:13

and oh so much more order Now our operators are

00:17

waiting for your call All right consider the following declaration

00:25

Which of the following correctly constructs this string Shmoop i

00:31

didn't hear the financial and all right oz waiver and

00:36

let's go ah String operations sure in all practicality we

00:41

couldjust say that string j equals shmoop but there's no

00:45

fun to be had in that in this case we're

00:47

being asked to combine slice and dice strings a through

00:50

d to successfully make shmoop as we go down the

00:54

line we're going to rely on the sub string method

00:57

which lets us isolate and use characters of our choosing

01:00

from a given string Well the sub string method is

01:03

given to parameters whenever it's called begin index and the

01:06

end index which indicate the specific characters inside the string

01:10

we want to use for example let's take option a

01:13

option a wants us to take the contents of string

01:16

a show and added to a sub string of string

01:20

See indexes begin with the Numbers 0 rather than 1

01:24

right So the begin index of three means we count

01:27

from left zero one two three like this we're starting

01:31

at zero The thing about the end index is that

01:34

we only go up to that number and don't included

01:37

in the substrate being that end Index's five well let's

01:40

count it up zero one Two three four five and

01:44

p is number five in the index but we don't

01:47

get to include it This gets us to shmoop which

01:52

is no good Option b is a sub string of

01:55

c combined with the entire string d right here begin

01:59

index here is zero so we're starting from the beginning

02:01

of string see the end indexes to someone count zero

02:04

one two and remember we don't get to keep the

02:07

character at the end index we're just getting from this

02:10

bit add to that entire string d and we just

02:14

get shoot not this one was missing it Option c

02:19

is just a simple combination of string a followed by

02:22

string see commission anyone feel like it's wheel of fortune

02:28

here in bizarro land all right option d could be

02:31

promising a couple of sub string operations while the first

02:35

one is a sub string of string be starting at

02:37

character one which is a church It'll never get us

02:41

to where we need to be so it's not deep

02:44

option e option is a sub string of string viet

02:47

index is zero and three and a sub string of

02:51

tea also in zero and three So let's see stringbean

02:54

deck zero means we start at the beginning We'll end

02:57

indexes three so zero one two three and we get

03:01

stringed ian deck zero then zero one two three again

03:05

and we get coop Combine the two and we get

03:08

moved Who Well but that's Not all Call now and

03:11

we'll throw in an additional sub string three thousand at

03:14

no additional cost Just pay shipping and handling one blade

03:17

for each hand means twice the slicing speed and quadruple 00:03:20.285 --> [endTime] the danger Operator's Not really waiting

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