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Question Paper of CS-16 - Object-Oriented Systems of Dec 1998 from IGNOU
Note : Question one is compulsory. Answer any three from the rest.
1. (a) Define the following terms with examples:
(i) Abstract Classes
(ii) Multiple Inheritance
(iii) Concurrency
(iv) Function Overloading
(b) Design an Object Oriented System for Employees Loan processing System (ELPS). Each employees is having eligibility to apply for loan depending on salary for a cycle, scooter or a car. ELPS should record the information like name of employee, date of joining, age, amount taken as loan, installment to be paid per month, balance remaining etc, ELPS should constantly update the last field (balance to be paid), installment to be paid (if it is not paid regularly) etc.
Observe the following during design.
� Clearly indicate public and private classes
� Clearly indicate base and super classes
� Design Constructors in each class and explain its purpose
� Implementation should be in C ++
© Design a Template class for sorting a list of elements
2. (a) Prepare object diagrams showing at least 10 relationships among the following object classes. Include associations, aggregations and generalizations. Use qualified associations and show multiplicity balls in your diagrams . You do not need to show attributes or operations. Use association names where needed. As you prepare the diagrams, you may add additional object classes: file system, file, directory, file name, ASCII file, executable file, directory file, disk, drive, track, sector
(b) What are the advantages of Object Oriented Design over Procedural Design?
3.(a) What new features should be added to SQL to provide better support for Object Oriented Concepts?
(b) Prepare a data flow diagram for computing the mean of a sequence of input values. A separate control input is provided to reset the computation. Each time a mean value is input the mean of all values input since it first reset command should be output. Since you have no way of knowing how many values will be processed between resets. The amount of data storage that you use should not depend on the number of input values. Detail your diagram down to the level of multiplication. Divisions and additions.
4. (a) Rephrase the following requirements to make them more precise. Remove any design decisions posing as requirements.
A system for distributed electronic mail over a network is needed. Each user of the system should be able to send mail from any computer account and receive mail on one designated account. There should be provisions for answering or forwarding mail, as well as saving messages in files or printing them. Also users should be able to send messages to several other users at once through distribution lists. Each computer on the net should hold any messages destined for computers which are down.
(b) Write code to implement the following:
One-to-many association, which is traversed in the direction from one to many. The association considered unordered Code should be in C++.
5.(a) Design a template class for implementation of a LINKED LIST.
(b) Implement the following class using C++ and any other non-object oriented language polygon.
6. Write short notes on
(a) Generalization
(b) Optimization
© Robustness
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