Page 40 - DCAP308_OBJECT_ORIENTED_ANALYSIS_AND_DESIGN

Object Oriented Analysis and Design

Notes

Case Study A Payroll Program

Consider a payroll program that processes employee records at a small manufacturing
firm. This company has three types of employees:

Managers: Receive a regular salary.
Office Workers: Receive an hourly wage and are eligible for overtime after 40 hours.

Production Workers: Are paid according to a piece rate.
Structured Approach
FOR EVERY EMPLOYEE DO
BEGIN
IF employee = manager THEN
CALL computeManagerSalary

IF employee = office worker THEN CALL computeOfficeWorkerSalary
IF employee = production worker THEN CALL computeProductionWorkerSalary
END

What if we add two new types of employees?
Temporary office workers ineligible for overtime, junior production workers who receive
an hourly wage plus a lower piece rate.

FOR EVERY EMPLOYEE DO
BEGIN
IF employee = manager THEN
CALL computeManagerSalary
IF employee = office worker THEN

CALL computeOfficeWorker_salary
IF employee = production worker THEN
CALL computeProductionWorker_salary

IF employee = temporary office worker THEN
CALL computeTemporaryOfficeWorkerSalary
IF employee = junior production worker THEN
CALL computeJuniorProductionWorkerSalary
END

Contd...

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