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AP Computer Science A Videos 108 videos
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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?
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
Full Transcript
- 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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