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AP Computer Science 4.4 Review of the Basics 181 Views


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Description:

APCS: Review of the Basics Drill 4, Problem 4. Which of the following correctly creates the string "milk"?

Language:
English Language

Transcript

00:00

Sorry Man here's your smoke to your reminding you that

00:05

there is no i in team But there is an

00:08

i in milk Great for the skin You should try

00:11

it That's Great Given the following string declaration string a

00:17

equals m l k which of the following correctly creates

00:22

the string milk And here the potential answers you Well

00:29

this question is asking us which of the five potential

00:31

answers would turn mlk into milk and goes about it

00:35

in a couple of different potential waste the first method

00:38

used in options and be used the strings indexes to

00:42

attempt to build milk one character at a time a

00:45

strings index numbers are a bit like having a card

00:48

catalog Each string has an index beginning with zero and

00:51

continues counting each character until the end of the string

00:53

including punctuation marks in spaces The strength frogs and toads

00:58

for example has an index from zero to fourteen and

01:01

if you pulled index ten you'd get the character teeth

01:05

All right let's try out what options and beer proposing

01:08

string a mlk has an index that would look a

01:11

little like this if we were to visualize it option

01:14

a attempts to build milk by first selecting index one

01:18

of m l k and that's letter l so this

01:21

is definitely not right Option b starts with index zero

01:24

which is m could start that it adds the necessary

01:28

i and then leaps to index three and four which

01:33

don't exist option c thru use the sub string method

01:38

which uses what we already know about indexes to select

01:41

a range of characters from a string rather than just

01:44

one at a time If we wanted to grab toads

01:46

from frogs and toads waken use sub string method with

01:49

the parameters ten as they begin index and fifteen is

01:52

the end index so we start here and in here

01:55

to grab everything in that range up to fifteen still

01:58

it's try option c we start by grabbing the subs

02:01

string from index zero one which gets us the m

02:03

there we go remember the end index goes up to

02:07

but does not include the index number given that we're

02:10

only going up to index one here and not including

02:13

it so we don't get the l then we insert

02:17

the eye okay and insert a sub string from index

02:20

one two three that's l and kay and we've done

02:23

it We've got milk looks like cy's gonna be our

02:26

answer But let's look at what's wrong with dna just

02:28

to be sure All right Well d starts with grabbing

02:31

a sub string at the index is zero and zero

02:33

of course the end index only goes up to but

02:36

does not include the character reference though Starting at zero

02:40

and going up to zero without including it gets us

02:42

a whole lot of nothing No m no milk option

02:46

E does practically the same thing A sub string at

02:48

the index is one and one that starts us an

02:50

l here and then goes up to but does not

02:53

include l So again we get a whole lot of

02:55

nothing And option c It is chocolate chip our favorite 00:02:59.228 --> [endTime] baby Yeah

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