ShmoopTube

Where Monty Python meets your 10th grade teacher.

Search Thousands of Shmoop Videos


Computer Science Videos 112 videos

Computer Science: Setting Up Your Environment
19 Views

Just as you move your furniture into a new house before spending the night, you’ve got to spend a little time setting up your environment when yo...

Computer Science: Doubles and Ints
17 Views

Doubles and ints. At first glance, it may look like this video will be about baseball and football statistics. But they're actually computer scienc...

AP Computer Science 1.1 Classes and Objects
468 Views

AP Computer Science: Classes and Objects Drill 1, Problem 1. Which of the following is a correct {/* Implementation */} for the isInsect method?

See All

AP Computer Science 2.4 Review of the Basics 195 Views


Share It!


Description:

APCS: Review of the Basics Drill 2, Problem 4. What is the output of the following code segment?

Language:
English Language

Transcript

00:00

Sorry And here's your smoke du jour courtesy of escaped

00:06

character whether it's hannibal lecter breaking out of prison or

00:10

a quotation mark escaping the tyranny of java syntax escaped

00:14

characters make everything more interesting All right what is the

00:18

output of the following code segment Things work right here

00:23

and here the potential answers All right pausing thinking and

00:28

we're going to answer this question We need to know

00:31

what exactly an escape character or escape sequence is And

00:36

when it's used Well this is one of those things

00:38

that doesn't get used frequently but when you need it

00:41

you'll wonder how you would have managed without it Yeah

00:44

like knowing how to catch a fish with your shoe

00:46

laces but not quite as dramatic In java a backslash

00:49

followed by a certain character is called in escape sequence

00:53

Let's suppose you want to print the following string in

00:56

a program The sign at the door red no hats

00:59

please but i wasn't technically wearing a hat It was

01:01

a raccoon not wanting to cause trouble mr scratchy and

01:04

on a left the interesting program you've got there The

01:08

problem with throwing that string in a normal print statement

01:11

is the quotation marks will confuse the compiler It believes

01:15

the first quotation mark from no hats please is the

01:18

end of the print statement after that it's expecting to

01:22

see more code and when that doesn't happen the compiler

01:25

will return an error There are a couple ways to

01:28

solve this problem First one would be tio not where

01:31

raccoon is a hat because second and more useful way

01:35

would be to escape the quotation marks in the string

01:40

So the compiler doesn't treat him like a code really

01:43

by placing a backslash in front of the quotation marks

01:45

we want to compiler to ignore We escape them and

01:49

they'll get asked like right through the prince stay just

01:52

like that though notice that we use the back slash

01:55

on the apostrophe too that's to prevent it from being

01:58

recognized as a single There are some special escape sequences

02:02

to a backslash followed by an end will insert a

02:05

new line at that position Backslash t will insert tab

02:09

and there are a few others that are a little

02:11

more obscure like this stuff Our question is asking us

02:15

what will happen with the following print statement so let's

02:18

look at the back slashes in the string The first

02:21

one will ensure the apostrophe gets past and not confused

02:24

for code So time will come out just fine Quotation

02:28

marks around testing are also properly escape so those quotation

02:32

marks will be printed correctly Then there's the backslash end

02:35

which is we just learned prints a new line and 00:02:38.63 --> [endTime] that's answered

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?