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Description:
APCS: Standard Data Structures Drill 1, Problem 3. Which of the following is the best postcondition for the fillArray method?
Transcript
- 00:00
Thank you We sneak and here's your shmoop too Sure
- 00:06
And by the way this week in history the first
- 00:08
software pirates sailed the high c plus plus is in
- 00:11
search of ruby and earl All our geeky coder friends
- 00:15
are really laughing at that one All right phil array
Full Transcript
- 00:19
method has the following preconditions our is a valid in
- 00:23
terrain declared with a specified length greater than or equal
- 00:26
to one Are that bar well which of the following
- 00:32
is the best post condition for the pillory method And
- 00:35
here the potential answers we're thinking we're thinking and if
- 00:40
we stop now we're thinking again okay free and post
- 00:43
conditions are like promises we make to ourselves almost like
- 00:47
new year's resolutions except we actually wind up keeping In
- 00:51
the case of the phil ary method we're working with
- 00:53
the precondition that r is a valid array of imagers
- 00:57
with a length greater than or equal to one let's
- 01:00
walk through the method to see what it actually does
- 01:03
well first line hear gives us an imager named flynn
- 01:06
which is the length of the array we're going to
- 01:09
be filling The next line starts up for life the
- 01:12
three parameters were set up to create emitter i as
- 01:15
the counter starting at zero and specifies that lupul run
- 01:18
until ice less than len becomes false and iterated I
- 01:24
buy one each time The looks like the code within
- 01:27
the loop itself visits the array of whichever position i
- 01:30
is at the time and fills that position's content with
- 01:33
again number that eyes that though position zero in the
- 01:37
array will contain the number zero position four will contain
- 01:41
the number four and so on Get it let's Look
- 01:44
at the potential answers option a this one says that
- 01:47
our is an imager array of length twenty Well no
- 01:51
the hillary method is written in such a way that
- 01:54
it'll fill an array of whatever size we specified Option
- 01:57
b says our is an imager array of a length
- 02:00
thread a ventricle the one and each value equals its
- 02:03
index Hey that sounds exactly like what we're making better
- 02:07
check the other cells What option c says is technically
- 02:10
true but it's less specific than option b and that
- 02:12
it doesn't say anything about the values being the indices
- 02:16
though it's not our best choice option d again with
- 02:19
the twenty thing no option a is pretty similar to
- 02:22
be except that the arrays and unspecified size that's not
- 02:26
true erase sizes definitely greater than zero because the loops
- 02:29
generator starts at zero and aloof runs until the generator
- 02:33
is equal to or greater than our yeah software pirate
- 02:37
joke we've beaten to death If we specified we wanted
- 02:40
in a ray the sides of negative three for example
- 02:42
aside from being impossible the four loop wouldn't run it
- 02:45
all because the generator is already greater than our and
- 02:49
no array would be generated Not only that but our
- 02:51
precondition already specified The array of length is greater than
- 02:54
or equal to one so nuts to that Our answer's 00:02:57.115 --> [endTime] Definitely B no not r it's b
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