March 30th, 2008IGNOU MCA Papers : CS16 OBJECT ORIENTED SYSTEMS
MCA (III Yr)
Term-End Examination
December, 2005
CS16 : OBJECT ORIENTED SYSTEMS
Time: 3 hours
Maximum Marks: 75
Note : Question No. 1 is compulsory. Answer any three questions from the rest.
1. (a) A manufacturing company has factories and offices in many major cities of India. The employees working in the offices are categorised as Managers, Engineers and Clerks. Employees working in the factories are categorised as Supervisors and Machine Operators. The company wishes to develop a system for managing the details of its employees. Identify the classes in the system and draw a class diagram. Each class must have at least three attributes and two operations. Explain the classes and associations, if any. (Marks 10)
(b) Why do we use object diagrams ? What are the two types of object diagrams ? Give an example of each type. (Marks 5)
(c) What is Overriding ? Explain two reasons for using overriding, with example. (6)
(d) Explain each of the following with an example : (Marks 9)
(i) Abstract Classes
(ii) Concrete Classes
(iii) Generalization
2. (a) Prepare an object diagram showing at least five relationships among the following object classes :
- Bank
- Branch
- Account
- Savings Bank Account
- Current Account
- Fixed Deposit Account
- Customer
Include associations and their qualifications, if any. Use association names, where needed. Add more classes, if necessary. You do not need to show attributes. (Marks 10)
(b) What do you mean by constraints ? Give examples for each of the following cases : (Marks 5)
(i) Constraints on objects
(ii) Constraints on links
3. (a) Given the class “Book” with attributes title, authors (one or more), publisher, ISBN No., price, no. of pages and weight, write the class definition in C++. Number of pages and weight are private attributes. Two methods used by this class are
get_no_of_authors( ) and calculate_carriage_cost().
The second method uses no. of pages and weight of the book to calculate carriage cost. (Marks 9)
(b) What is polymorphism ? Explain its use with the help of an example. (Marks 6)
4. (a) What is the purpose of using a functional model ? Give an example of functional model. Also explain the following terms in the context of data flow diagrams : (Marks 7)
Process, Data Row, Data Store
(b) Explain how generalizatlon is mapped to tables with the help of an example. (Marks 5)
(c) Explain ternary association with an example. (Marks 3)
5. (a) Draw an ER diagram f or a cricket tournament. The information to be depicted in the diagram includes teams, members of the teams, captain, manager and coach of each team, matches of the tournament, runs scored by each team in each match, winner of each match.
Identify the entities and show relationships among them. Include attributes wherever necessary. (Marks 10)
(b) What is metadata ? Explain concept of meta class with an example. (Marks 5)
