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SWEN30006 Exam 2018 S1 Page 1 of 32
School of Computing and Information Systems
SWEN30006 Software Modelling and Design
Examination: 2018 End of Semester 1
Reading Time: 15 minutes This paper has 32 pages.
Writing time: 120 minutes Total marks for this paper: 120
Student Number: ________________________
Authorised Materials
• Calculators: Not permitted.
• Dictionaries: Paper-based language translation dictionaries are permitted provided they
are not annotated in any way.
• Notes: Two double-sided A4 sheets of notes are permitted.
Instructions to Invigilators
• Students should initially receive just this exam paper with 32 pages.
• Provide script books on request.
• Students may NOT keep the exam paper after the examination.
Instructions to Students
• Write your student number on this exam paper during writing time.
• Attempt all questions.
• The marks for each question are indicated at the beginning of each question.
• The marks are an indication of how much time should be spent on the question.
• Answer questions only in the boxes on the exam paper.
• The blank pages can be used for rough working and notes and will not be marked.
• State clearly and justify any assumptions you have made.
• Write legibly in blue or black pen.
• Draw diagrams legibly: pencil is permitted for drawing diagrams.
• You may request and use a script book if you run out of space in a box for your answer:
ensure your answers in the script book are clearly labelled with the question number.
• Mobile phones, tablets, laptops, and other electronic devices, wallets and purses must
be placed beneath your desk.
• All electronic devices (including mobile phones and phone alarms) must be switched off
and remain under your desk until you leave the examination venue. No items may be
taken to the toilet.
This paper is not to be reproduced and lodged with Baillieu Library.
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[15 marks]
For each of the following terms, briefly define it and explain its importance in relation to
software design:
a. Representational gap
b. Coupling
c. Cohesion
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[10 marks]
In the context of domain modelling, for each of the following elements: define it, describe
when it should be used, and provide an example.
a. Description class
b. Composition
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[10 marks]
a. Describe the Information Expert pattern and provide an example to illustrate its
application.
b. Describe the Creator pattern and explain why particular Creator options are given
priority over others.
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[7 marks]
In the context of mapping a design to code:
a. [2] The guideline for translating design classes to code is to work from least coupled to
most coupled. Briefly justify this guideline.
b. [5] Explain how design associations with multiplicities greater than one can be mapped
to code, and what should guide the choice of representation. Provide an example.
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[10 marks]
Question 5 Part 1. [4 marks]
Briefly describe architectural analysis and why it is important.
Question 5 Part 2. [6 marks]
For each of the following, provide an example and briefly explain why it is architecturally
significant:
a. An architecturally significant functional requirement.
b. An architecturally significant non-functional requirement.
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[18 marks]
This question relates to the domain model below. This is the iteration-3 domain model for
the Monopoly case study from Applying UML and Patterns, 3rd Ed. by Larman.
SWEN30006 Exam 2018 S1 Page 15 of 32
Below is a list of changes to the Monopoly game. For each change, describe precisely or
draw the corresponding change (if any) that should be made to the Monopoly domain
diagram. You should not redraw the whole diagram.
a. [2 marks] A new move rule is introduced. If a Player P is about to move their Piece to
a Square, and there is already another Player’s Piece on that Square, Player P will
instead move their Piece to the next Square without a Piece already on it.
b. [2 marks] One of the Railroad Property Squares is replaced by another Income Tax
Square.
c. [6 marks] A new kind of square called a Park is created; there are four different Parks.
Every Player is required to choose their favourite Park at the start of the game (they
can choose the same Park if they wish). However, Players can’t own Parks.
d. [8 marks] For this change you should assume that: (i) every turn taken by a player is
numbered in sequence starting with 1; (ii) Properties can be bought and sold by
Players; and (iii) once a Property has been bought, it will always be owned by some
Player. New rules are introduced to the game that depend on knowing the
Properties owned by every Player in every turn. An example of one of these rules is:
when a Player lands on a Property, if they previously owned that Property they get a
discount on rental based on the total number of turns for which they owned that
Property. Note that we still need to know who owns which Properties currently (as
per the Owns association).
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SWEN30006 Exam 2018 S1 Page 19 of 32
[27 marks]
The passage below describes the ZProcess software system. It is important that this system
maintains a high degree of availability; the box below describes how this is to be achieved.
Question 7 Part 1. [5 marks]
This ZProcess system requires protected variation. What is protected variation, what are the
two different kinds of variations we need to consider, and which of these kinds is required
by ZProcess?
The Important_Process object needs to do_important_stuff() involving a special
algorithm ZAlg, which operates on a sequence of ZInput to generate a ZOutput. We
have access to two different versions of ZAlg, one implemented in a library ZAlg_Library
and one available through an external service ZAlg_Service. The external service can
deal with larger input sequences than the library, so the plan is to use the service when
available, but resort to the library otherwise.
SWEN30006 Exam 2018 S1 Page 20 of 32
A partial design class diagram (DCD) showing public elements and some code snippets from
the implementation for ZProcess are provided below.
Helper_ZAlg_Library
+ apply_ZAlg(zinputs :ArrayList) :ZOutput
Helper_ZAlg_Service
+ apply_ZAlg(zinputs :ArrayList) :ZOutput
Important_Process
+ zalg :ZAlg_Interface
+ zinputs :ArrayList
+ zoutput :ZOutput
+ do_important_stuff() :void
«interface»
ZAlg_Interface
+ apply_ZAlg(zinputs :ArrayList) :ZOutput
external::ZAlg_Service
+ start() :void
+ enter(zinput :ZInput) :void
+ finish() :ZOutput
third_party::ZAlg_Library
+ zAlg() :ZOutput
+ zAlg(zinput :ZInput) :ZOutput
+ zAlg(zinput1 :ZInput, zinput2 :ZInput) :ZOutput
+ zAlg(zinput1 :ZInput, zinput2 :ZInput, zinput3 :ZInput) :ZOutput
«use» «use»
+zalg
SWEN30006 Exam 2018 S1 Page 21 of 32
Question 7 Part 2. [7 marks]
What GoF design pattern is most prominent in the ZProcess design? Describe this pattern,
with clear reference to the ZProcess system as a concrete example.
SWEN30006 Exam 2018 S1 Page 22 of 32
SWEN30006 Exam 2018 S1 Page 23 of 32
Question 7 Part 3. [15 marks]
Consider a case where do_important_stuff() generates exactly two ZInputs and applies ZAlg
to them. Illustrate this scenario with a design sequence diagram, using the methods in the
design/implementation elements provided above. Be sure to cover the behaviour for both
the service and library cases. You can assume that zalg is already initialised and all relevant
objects already exist.
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SWEN30006 Exam 2018 S1 Page 27 of 32
[23 marks]
The following questions refer to the passage below which describes the Pennand ATM
(Automated Teller Machine). The sentence numbering is provided to make it easier for you
to track the various elements of the description.
Question 8 Part 1. [5 marks]
Draw a use case diagram, covering the Pennand ATM description above.
Question 8 Part 2. [18 marks]
Draw a state machine diagram for the Pennand ATM, based on the description above.
1. The ATM allows an account holder to check the balance or make a withdrawal on
one of their accounts.
2. When the ATM is idle, they can insert their transaction card and enter their PIN; the
ATM will authenticate (via the banking network) the id from the card and their PIN.
3. If authentication is successful, the network will return the list of accounts associated
with the card. (Otherwise the ATM returns to the idle state.)
4. The customer can then select an account.
5. The ATM will retrieve (via the banking network) and then display the account
balance.
6. The customer can then choose to make a withdrawal from the selected account or
choose another account.
7. If the customer chooses to make a withdrawal, they then enter the amount; if their
account has sufficient balance, the ATM dispenses the amount in cash.
8. The customer can choose to end their transaction at any point other than when the
ATM is dispensing cash; on ending the transaction, the ATM will return to the idle
state.
9. A successful withdrawal is recorded via the banking network.
10. The ATM will return the account holders transaction card before returning to the
idle state (unless the card is identified as stolen – see below).
11. The Pennand ATM also has features designed to support ease of use, maintenance,
and security.
12. When a customer first inserts their card, the ATM will photograph the customer and
check the card details against a list of stolen cards (stored locally); a stolen card will
be kept in the ATM and a message sent to the Police Card Agency, before the ATM
returns to the idle state.
13. If the ATM at any stage detects a fault, it switches itself into out-of-service mode; a
maintenance technician can then use this mode to conduct diagnosis/repairs, before
shutting down and restarting the ATM.
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End of the Exam Questions
End of the Exam Paper

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