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Classes and Objects Videos 18 videos
AP Computer Science 2.3 Classes and Objects. Which of the following is correct implementation of the Country class?
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AP Computer Science 4.1 Classes and Objects 174 Views
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Description:
AP Computer Science 4.1 Classes and Objects. Which of the answers is the best definition of a postcondition?
Transcript
- 00:00
Hurry And here's your shmoop du jour brought to you
- 00:05
by the wealthy man who drove his car into a
- 00:07
tree You found out how the mercedes benz all right
- 00:12
let's take a look at our question which of the
- 00:14
bolo answers is the best definition of ah post condition
Full Transcript
- 00:20
flavours All right we'll write up the bat we can
- 00:23
eliminate answer c We know that a post condition has
- 00:26
to do something with the aftermath of a situation We
- 00:29
know this from the latin root post Meaning after or
- 00:32
behind a post condition is an assertion about a piece
- 00:36
of code What should be true at the end of
- 00:39
it not necessarily what is true By the end we'll
- 00:42
post conditions are not always met Do tow bugs and
- 00:45
logic errors take a real life example You should always
- 00:48
follow the speed limit but no one actually does In
- 00:54
other words close conditions tell you what the code segment
- 00:57
is meant to achieve not what it actually achieves So
- 01:01
now let's Take a look at answer b d Any
- 01:03
differences air subtle but are important Answering the question well
- 01:06
he is talking about the output of the program referencing
- 01:09
console output that's usually produced by a code segment And
- 01:13
he references the actual effect of the code segment like
- 01:15
the variables it modifies and the actions it's completed All
- 01:20
right well we can see that be accurately describes our
- 01:22
definition of a post condition A statement of what should
- 01:25
be true after the code segment is run of such
- 01:29
a shame that everyone is fuming over the high cost 00:01:32.008 --> [endTime] of gas these days
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