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AP Computer Science A Videos 108 videos
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AP Computer Science 1.1 Program Development 404 Views
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Description:
AP Computer Science 1.1 Program Development. The situation in the video is an example of which of the following?
Transcript
- 00:00
Thank you We sneak and here's your smoke too Sure
- 00:05
brought to you by the dreaded trinidadian scorpion nightmare pepper
- 00:09
one drop of its juicy spicy enough to send a
- 00:12
horse on a spirit flat software engineer rights program composed
- 00:16
of many small simple functions and a few functions that
Full Transcript
- 00:20
utilize small functions in order to perform more complex tasks
- 00:24
This is an example of which of the following and
- 00:28
here the potential answers roman numerals Thank you and let's
- 00:33
go all right Greater concept of program development refers not
- 00:38
so much of the actual writing of coat it's more
- 00:40
about designing programs overall structure on a larger scale A
- 00:44
few concepts that can help in planning a large coding
- 00:46
project are polymorphism pop down design and functional decomposition right
- 00:53
The first polymorphism comes from greek many and form core
- 00:58
shape it's the idea that a subclass can override a
- 01:02
method of the same name that it inherited from a
- 01:05
super class right So for example let's say you've got
- 01:09
a class called both well The classic boat comes with
- 01:12
a method called steer load that contains code for steering
- 01:16
any both object but let's say we've also got a
- 01:19
subclass of boat called crew shin will cruise ship also
- 01:23
has its own method called steer boat that overrides the
- 01:26
one inherited from boat and includes along with it a
- 01:28
new method called avoid iceberg one that way when you're
- 01:33
out and about your program and you have any boat
- 01:35
or vote subclass object whether it be a boat or
- 01:38
a cruise ship or raft you can call the steer
- 01:41
boat method and cruise ship objects will get their overriding
- 01:45
version of steer boat that includes avoid iceberg right it's
- 01:48
a useful thing to know when planning a big project
- 01:50
but it doesn't sound quite like the technique our engineers
- 01:53
used in this case All right next up top down
- 01:56
design pop down design is the concept of coming up
- 01:59
with a larger so for the program first by nailing
- 02:02
down the larger functions and then filling in the details
- 02:04
later on We get useful concept but it doesn't sound
- 02:07
too much like what are engineered it in this case
- 02:10
either Then we have functional decomposition The idea here is
- 02:14
to split a complex function into a lot of smaller
- 02:16
functions then stitch them together by calling those functions through
- 02:19
Larger fun well let's think about making chili chili smells
- 02:24
great If you were right now your chili making processes
- 02:27
of function in java well one way to do it
- 02:30
would be to write a single meandering function that handles
- 02:33
every part of the process from chopping vegetables Adding spice
- 02:38
is actually doing the cooking but that's not terribly wise
- 02:41
like what if your out of onions what if you
- 02:43
need to update the recipe the whole thing could break
- 02:46
and it'd be a total mess So if you were
- 02:48
to write a functional decomposition in mind you'd probably have
- 02:51
chopped vegetable is a function that would accept a variety
- 02:54
of variables Add spices would probably get called here and
- 02:57
there at chili's would get called over and over again
- 03:00
And then you get a research sounds an awful lot
- 03:03
like what our engineer did here a number of small
- 03:05
simple functions that get used by other functions to perform
- 03:09
complex tasks That's answer c room you're looking for is 00:03:14.37 --> [endTime] down the hall left three
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