CMPS 222 - Homework 5

Homework 5 - Inheritance and Polymorphism

Due: Wednesday, March 4, 2009 at 5:00pm

Coding Conventions

Use the same coding conventions as described in Homework 1. Additionally, make sure to indent each section of the class in the class definition.

Assignment

The purpose of this assignment is to create two children classes that use polymorphism for some of their functions.

You will define the following class hierarchy:

                 Employee
                 /      \
                /        \
               /          \
       hourlyEmployee    salariedEmployee

The Employee class will be similar to, but NOT identical to, the class used in Lab 6. Use hw5main.cpp as your main function. Note that it uses a parent class pointer to call the polymorphic function. If you use seperate compilation, you will need to modify hw5main.cpp to include the filenames you use for your header files. Also, be sure to submit all files (header files, implementation files and the modified hw5main.cpp) if you use seperate compilation. Alternatively, you can just code all of these class within hw5main.cpp and submit just that file.

Use the following lists of features to code each class.

Employee class

The is the parent class. It will define the name and social security number. Unlike Lab 6, it will have no useful public functions for the outside world to use. Most of the functions will be in the protected section for the two children class to access. The only public functions will be the ones used for polymorphism.

Private section

A character array or string for the name
A character array or string for the SSN
An integer for the number of weeks included in the pay period

Protected section

void setName(char *) - Takes a character array or string (change the parameter list if you use a string). Copies that into the name variable.
const char* getName() - Returns a character array or string (change the return type if using a string) containing the current name.
bool setSSN(char *) - Takes a character array or string (change the parameter list if you use a string). Verifies that there are 9 digits (see Lab 6 for how to do this). If there are 9 digits, copies to the SSN and returns true. Otherwise, rejects the string by returning false and leaves SSN as it is.
const char *getSSN() - Returns a character array or string (change the return type if using a string) containing the current SSN.
bool setWeeks(int) - Verifies that the given int is one or higher. If it is, it copies the integer over to the number of weeks in the current pay period and returns true. Otherwise, it leaves the weeks untouched and returns false.
int getWeeks() - Returns the number of weeks in the pay period.

Public section

Default constructor - Set the name and SSN to the empty string. Sets weeks to 0.
Copy constructor - Copy the name, SSN and weeks from the source object.
virtual void printEmployee() - For this class, print "Undefined employee" to standard out (the screen).

hourlyEmployee class

This class inherits from the Employee class publically. It defines an employee who gets paid by the hour. Be sure to verify that the hours worked are positive and that the rate is above minimum wage.

Private section

A double for the hourly rate the employee is paid
A double for the hours the employee has worked this pay period

Public section

Default constructor - Sets the rate and hours worked in the pay period all to 0. Invokes the parent default constructor to initialize name, SSN and weeks.
Copy constructor - Copies the rate and hours worked in the pay period from the source object. Invokes the parent's copy constructor to copy the name, SSN and weeks in the pay period.
bool setRate(double) - Verifies that the given double is at least minimum wage ($8.00). If it is, it copies the double over to rate and returns true. If it is not, it leaves the rate untouched and returns false.
double getRate() - Returns the current value for rate.
bool setHours(double) - Verifies that the given double is positive (0 is fine too). If it is, it copies the double over to the hours worked and returns true. Otherwise, the hours worked is left untouched and it returns false.
double getHours() - Returns the current value for hours worked.
void setEmployee() - Prompts the user for the name, SSN, weeks in the current pay period, hourly rate and hours worked for the pay period. Uses the set functions (setName, setRate, etc) to set the values. If any of the set functions returns false (invalid data has been given), the user will be prompted to re-enter that piece of information.

virtual void printEmployee() - Prints a pay stub similar to the following:

Name: Jane Doe               SSN: 6789       Employee Type: Hourly
Pay Period: 2 weeks     Pay Rate: $10.50      Hours Worked: 10
Gross Pay: $105.00

salariedEmployee class

This class inherits from the Employee class publically. It defines an employee who gets paid a fixed, monthly salary. Be sure to verify that the monthly salary is positive.

Private section

A double for the monthly salary

Public section

Default constructor - Sets the salary to 0. Invokes the parent default constructor to initialize the name, SSN and weeks.
Copy constructor - Copies the salary from the source object. Invokes the parent copy constructor to copy the name, SSN and weeks in the pay period.
bool setSalary(double) - Verifies that the given double is greater than 0. If it is, it copies the double to the salary and returns true. Otherwise, it leaves the salary untouched and returns false.
double getSalary() - Returns the current salary.
void setEmployee() - Prompts the user for the name, SSN, weeks in the pay period and monthly salary of the employee. Uses the set functions (setName, setSalary, etc) to set the values. If any of the set functions returns false, prompt the user to re-enter the information.

virtual void printEmployee() - Prints a pay stub similar to the following:

Name: Jane Doe               SSN: 6789       Employee Type: Salaried
Pay Period: 2 weeks                         Monthly Salary: $4000.00
Gross Pay: $2000.00