ENGR135 Take Home Midterm (11/24/01)

README

• You HAVE to print out all the answers as well as the output and source listings of the programming assignments. Please hand in both the printouts and a diskette containing your programs. The exam is collected in class on 12/01/01. If you are late in any way, 50% will be taken off in the first day, then 100% in the second day and after.
• If the instructor cannot show up on 12/01/01, the exam will be collected in the next lecture. This will only happen under extreme situation.
• DO NOT talk about the exam, COMPARE the exam, DISCUSS the exam, WORK WITH OTHER PEOPLE on the exam and CHEAT in any way you could think of. If two answers are found to be the same due to cheating. An F will be given for the course as a result and a letter might be sent to Dean of Students and the Engineering Department. I do not want to do any of that, so LEARN the materials and DO IT YOURSELF.

MID TERM QUESTIONS

• The exam will total to 200 points.
• If you think the questions are not stated clearly in any way, WRITE down your assumptions and answer the questions. No email answer can be obtained from the instructor individually in order to be fair with all the students.
• Good Luck and have fun.

Lecture Questions

(l1). List three ways of identifying Classes and Objects as covered in lectures. (6 points)

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(l2). What is the difference between Architecture Patterns and Design Patterns? (4 points)

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(l3). Draw a scenario diagram according to the Proxy design pattern when a client needs to do a task with a Proxy system. (10 points)

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Reading Questions

All questions are from chapter 1 to chapter 5 of the textbook: “Object-Oriented Systems Analysis and Design, Ronald J. Norman, Prentice Hall”. Points are only awarded when the answers are exact. So, read carefully.

(r1). One of the common theory object-oriented methodology based on uses examples such as grouping trees into tree class or grouping buildings into a building class. What is this method or theory called? (10 points)

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(r2). List all the forms of reuse and explain briefly what they are. (10 points)

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(r3). In general, what is a noun phrase strategy trying to find? List the procedure of how to do a noun phrase strategy. (10 points)

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(r4). In the Kozar’s requirement model, what does the “Tactics & Needs” stage do? (10 points)

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(r5). What is an automated information system? (10 points)

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Implementation Question

(i1). Develop an object model, including classes and attributes of the following "copy machine" problem. You can make reasonable assumptions. (20 points)

• The machine copies A4 size paper only.
• If the original is too big, the machine will indicate a warning of size mismatch.
• The machine can do either black & white or color copy.
• The price for black & white is 25 cents and color is $1.
• Users can select how many copies to be done.
• Users have to input money first before any copy can be done.
• The machine accepts only quarters. Other coins are immediately returned.
• An error message will be displayed if the money inputted is not enough.
• Quarters exceeding the cost of copying are also returned when the copy button is pressed.
• The vending machine has two buttons, a black & white copy button and a color copy button.
• (This is the same as the in-class exercise, so you should remember what it kind of looks like. However, you should redo the object model one more time as an individual to make sure that you are able to implement it by yourself. Also, remember that you have to do the whole midterm including this problem by yourself.)

(i2). Draw a Global State Transition Diagram (STD) for i1. (10 points)

(i3a). Use any programming language (Java, C++, C) to implement the object model in part 1. If the object model does not include a client or user, implement a client that uses a text menu to operate the copy machine. For example:

Copy Machine Menu:

1. Deposit money
2. Press Black/White button
3. Press Color button
4. etc …

I will use the above menu to grade this part of the question. (90 points)

(i3b). Write down 5 detail test cases on how to test your implementation in i3a. (10 points)

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