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CHAPTER 9 Software Design
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C.4 1 2 2.1 2.2 3 4 5 6.1 6.2 6.3 6.4 6.5 X
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C.6 C.7 C.8 C.9
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C.10
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CHAPTER 9 Software Design
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6.6 6.7 7 7.1 7.2 7.3 X X X X
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As shown in the tables above, there are a number of blank rows and blank columns. Requirement 5 is related to vacancies. There is not explicit handling of vacancies, although a vacancy should be the absence of a reservation on a particular date. Requirement 6.3 is the customer phone number, and it is missing. Requirement 6.5 is the agreed upon price, which is missing from the reservation information. Requirement 7.1 mentions the 1 day s payment, which is also not in the attributes. Column A.1 is the daylist, which is included to help search for vacancies. B and B.1 are necessary but not specific to a requirement. C.8 is a constructor. D.1 through D.4 are details of the transactions, which are neglected in the requirements.
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Review Questions
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1. Given the following design, indicate for the following ideas of coupling, cohesion, and abstraction whether it is desirable to have a high or low value and how this design exempli es the term. Class college student* stulist[MAX] course* courselist[MAX] public: addStudent(char* studentname) addStudentToCourse(char* studentname, char* coursename) void displayStudent(char* studentname) void displayStudentsInCourse(char* coursename) Class course student* classroll[MAX] public: void displayStudents()
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Class student char* name public: void displayname()
CHAPTER 9 Software Design
2. Why does Gunter restrict the terms/events that can be used in a speci cation What is the di erence between a user s requirements and a speci cation 3. The proposed system is a face recognition based on image processing. The system will have a camera and is intended to prevent nonemployees from entering the company s secret facilities by controlling the lock on the door. When a person tries to turn the door handle, the system takes an image and compares it with a set of images of current employees. Classify each of the following events as to whether the events are in the environment or in the system and whether the events are hidden or visible: 1. A person tries to turn the door handles. 2. The door is unlocked by the system. 3. An employee lets a nonemployee through the door. 4. An employee has an identical twin. 5. An image has the minimal number of similarities for the matching algorithm.
Problems
1. Draw scenarios for the interaction between a customer trying to buy a particular music CD with cash and a clerk in the music store. Be sure to cover all possibilities. Use the state machine model with the events being the arcs. 2. Calculate Bieman and Ott s functional cohesion metrics for the following code segment. Draw a directed graph and show the ows. cin >> a >> b; int x,y,z; x=0; y=1; z=1; while (a > 0){ x = x + b; z = z * b; if (a > b){ y=y*a; } a=a-1; } cout << x << a << z << y; }
CHAPTER 9 Software Design
Answers to Review Questions
1. Given the following design, indicate for the following ideas of coupling, cohesion, and abstraction whether it is desirable to have a high or low value and how this design exempli es the term. Class college student* stulist[MAX] course* courselist[MAX] public: addStudent(char* studentname) addStudentToCourse(char* studentname, char* coursename) void displayStudent(char* studentname) void displayStudentsInCourse(char* coursename) Class course student* classroll[MAX] public: void displayStudents() Class student char* name public: void displayname() Coupling Low coupling is desirable, and this design has low coupling, since the college class has no knowledge of the internals of the other classes and the other classes do not need to know about college. Cohesion High cohesion is desirable, and this has high cohesion, since each class just deals with its own attributes. Abstraction The design shows good abstraction. For example, the display method in college does not include any details about lower-level display methods. 2. Why does Gunter restrict the terms/events that can be used in a speci cation What is the di erence between a user s requirements and a speci cation Gunter says that a user s requirements must be speci ed in terms/events that are known to the user and may include terms/events hidden to the machine, while a speci cation is designed to be the basis of the implementation and must be speci ed only in terms that are visible both to the machine and the world. 3. The proposed system is a face recognition based on image processing. The system will have a camera and is intended to prevent nonemployees from entering the company s secret facilities by controlling the lock on the door. When a person tries to turn the door handle, the system takes an image and compares it with a set of images of current employees. Classify each of the following events as to whether the events are in the environment or in the system and whether the events are hidden or visible:
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