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AP Computer Science 4.2 Review of the Basics 186 Views


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Description:

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

Language:
English Language

Transcript

00:00

Thank you We sneak And here's your smoke usually brought

00:05

to you by extreme couponing brought to you by coupons

00:09

Dot com the finest couponing site on the web You

00:12

never know when you'll need eighty thousand rolls of paper

00:14

towels Yeah you do All right What is the output

00:20

of the following code segment Go string beyond and here

00:26

the potential answers Yeah All right two relatively simple lines

00:32

of code here The first line creates a string called

00:35

beyond that contains thank you The saint line prince outlines

00:42

his content is our beyonce string but not so fast

00:45

The sub string method appears to be acting on our

00:48

string with two parameters that's one and six yeah some

00:53

string is actually a very useful method for working with

00:56

just a section of a string by specifying starting in

00:59

points you can sniff out a section of string just

01:01

like clipping out of coupon hey free creamed corn baby

01:06

do parameters given to the sub string method are the

01:08

start and end points for our cut Well technically they're

01:11

referred to as the begin index and nd index and

01:14

in this example that begin indexes one on the end

01:17

index is six This question is really just a matter

01:20

of figuring out where were clipping are some string in

01:23

java string indexes As with most computerese things counting begins

01:27

at zero being that bee is the first character and

01:31

thus zero will begin clipping after be at why there

01:36

All right our end indexes six but in the business

01:39

of indexes we only go up to the end index

01:41

and do not included So we'll move along over like

01:45

this up to six but without including it and there

01:48

we have it that's what will be displayed thanks to

01:50

the sub string method and looking at a possible answer

01:53

these match answers a c and he all contained the

01:56

b of ours They're obviously trying to trick those of

01:59

us who fail to remember that index counting begins at

02:02

zero rather than one try Guys Answer b was also

02:06

being sneaky It starts counting in the right spot but

02:08

it includes one too many characters at the end remember

02:11

that we don't include the end index character in the

02:14

substrate We only go up to it though did it 00:02:16.43 --> [endTime] is and in a reserve

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