ShmoopTube

Where Monty Python meets your 10th grade teacher.

Search Thousands of Shmoop Videos


AP Computer Science A Videos 108 videos

AP Computer Science 1.2 Program Development
293 Views

AP Computer Science 1.2 Program Development. Which of the following is correct?

AP Computer Science 2.3 Classes and Objects
191 Views

AP Computer Science 2.3 Classes and Objects. Which of the following is correct implementation of the Country class?

AP Computer Science 2.3 Program Development
195 Views

AP Computer Science 2.3 Program Development. What is correct implementation of the Emperor constructor method?

See All

AP Computer Science 4.4 Review of the Basics 181 Views


Share It!


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

Related Videos

AP Computer Science 1.2 GridWorld Case Study and APIs
493 Views

AP Computer Science 1.2 GridWorld Case Study and APIs. What is the direction of the actor?

AP Computer Science 1.4 Standard Algorithms
200 Views

AP Computer Science 1.4 Standard Algorithms. How many times will mystery be called for mystery(n) for n > 1?

AP Computer Science 2.3 Classes and Objects
191 Views

AP Computer Science 2.3 Classes and Objects. Which of the following is correct implementation of the Country class?

AP Computer Science 3.4 Inheritance, Abstraction, and Polymorphism
204 Views

AP Computer Science 3.4 Inheritance, Abstraction, and Polymorphism. Which of the following will satisfy the conditional if statement for boo, str,...

AP Computer Science 4.2 Standard Algorithms
191 Views

AP Computer Science 4.2 Standard Algorithms. What kind of algorithm is the following?