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AP Computer Science 2.5 Standard Data Structures 172 Views
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Description:
AP Computer Science 2.5 Standard Data Structures. Which of the following correctly declares and fills a String array of length 3?
Transcript
- 00:00
Thank you We sneak Then here's your shmoop du jour
- 00:05
brought to you by build it yourself furniture you'll save
- 00:08
a little money but make up the difference in agonizing
- 00:12
screams late into the night which of the following correctly
- 00:15
declares and fills a string array of length Three and
Full Transcript
- 00:19
here your potential answers exacts guy next time All right
- 00:26
the old question about declaring and populating in array have
- 00:29
been asking that since caveman days well in this case
- 00:32
it's an array of strings There are three small steps
- 00:36
involved to get such a thing up and running the
- 00:38
first two steps there declaring a variable to refer to
- 00:40
an array and then allocating memory to hold the values
- 00:44
And there are two ways to do that little dance
- 00:47
either on one line or two Much of the official
- 00:50
Job documentation uses the 2 line method because it's a
- 00:52
teeny tiny bit more flexible by separating the variable declaration
- 00:56
from memory allocation you can hold off with a second
- 00:59
line and allocate memory only once you need it For
- 01:02
most objects it'll never be an issue but in cases
- 01:05
dealing with tons of a raise or vast amounts of
- 01:07
data it could become a thing for these three little
- 01:10
strings It wouldn't matter whether we one line or two
- 01:13
line it but now you can build the bookshelf Sure
- 01:16
it took half a saturday and both thumbs got smashed
- 01:19
but now it can be loaded Yeah the proper way
- 01:22
to do so is to start a position zero and
- 01:24
go from there Option c andy failed to start with
- 01:27
zero and jump right toe one which is enough to
- 01:30
cause your program Teo flip it's wig interestingly enough sandy
- 01:33
get the first part Correct They each properly declared their
- 01:36
variable and allocate memory using the one into line methods
- 01:39
but goof it on the follow through with that starting
- 01:42
at one business Yeah did more option a doesn't do
- 01:45
it quite right In fact it watches the declaring process
- 01:48
quite a bit it's attempting to be some weird combination
- 01:51
of allocating and declaring but without specifying the new operators
- 01:55
So not gonna fly option e look closely It's attempting
- 01:59
the two linemen method but it's not declaring an array
- 02:02
There are no brackets after string So rather than getting
- 02:05
an array of strings we just get a single string
- 02:08
The next line where Is made into a new array
- 02:10
of size Three just isn't going to mess with that
- 02:13
option B is where it's at a rave strings a
- 02:16
equals new string array of size three Then it properly
- 02:19
loads it full of stuff and we can wait Oh 00:02:24.368 --> [endTime] there should be a receipt around here somewhere
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