Object
Object-
-Oriented Programming
Oriented Programming
(OOP)
(OOP)
Lecture No. 30
Lecture No. 30
Polymorphism
Polymorphism –
–Case Study
Case Study
A Simple Payroll Application
A Simple Payroll Application
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Class Employee-Object Oriented Programming-Lecture Slides, Slides of Object Oriented Programming
Main topics in this course are object-orientation, objects and classes, overloading, inheritance, polymorphism, generic programming, exception handling, introduction to design patterns. This lecture includes: Class, Employee, Statment, Problem, Report, Shape, Array, Polymorphism, Return, Main
Typology: Slides
2011/2012
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Object
Object
Oriented Programming
Oriented Programming
(OOP)
(OOP)
Lecture No. 30
Lecture No. 30
Problem Statement
Problem Statement
►
►
Develop a simple payroll application. There
Develop a simple payroll application. There
are three kinds of employees in the system:
are three kinds of employees in the system:
salaried employee, hourly employee, and
salaried employee, hourly employee, and
commissioned employee. The system takes commissioned employee. The system takes
as input an array containing employee as input an array containing employee
objects, calculates salary polymorphically,
objects, calculates salary polymorphically,
and generates report.
and generates report.
Class SalariedEmp
Class SalariedEmp
class SalariedEmp : public Employee class SalariedEmp : public Employee
private: private:
double salary;
double salary;
public: public:
SalariedEmp(String&,double,double);
SalariedEmp(String&,double,double);
virtual double calcSalary();
virtual double calcSalary();
Class HourlyEmp
Class HourlyEmp
class HourlyEmp : public Employee {class HourlyEmp : public Employee {
private:
private:
int hours; int hours;
double hourlyRate;
double hourlyRate;
public:public:
HourlyEmp(string&,double,int,double); HourlyEmp(string&,double,int,double);
virtual double calcSalary();
virtual double calcSalary();
Class CommEmp
Class CommEmp
CommEmp::CommEmp( String& n, CommEmp::CommEmp( String& n,
double tr, double s, double cr ) double tr, double s, double cr )
: Employee( n, tr ) {
: Employee( n, tr ) {
sales = s;
sales = s;
commRate = cr;
commRate = cr;
A Sample Payroll
A Sample Payroll
int main() {
int main() {
Employee* emp[10]; Employee* emp[10];
emp[0] = new SalariedEmp( emp[0] = new SalariedEmp( ““AamirAamir””,,
emp[1] = new HourlyEmp( emp[1] = new HourlyEmp( ““FaakhirFaakhir””,,
emp[2] = new CommEmp(
emp[2] = new CommEmp( “
Fuaad
Fuaad ”
generatePayroll( emp, 10 );
generatePayroll( emp, 10 );
return 0;
return 0;
Shape Hierarchy Revisited
Shape Hierarchy Revisited
Shape
Line Circle Triangle
draw
calcArea
draw
calcArea
draw
calcArea
draw
calcArea
Shape Hierarchy
Shape Hierarchy
class Line : public Shape { class Line : public Shape {
public: public:
Line(Point p1, Point p2);
Line(Point p1, Point p2);
void draw(){ cout << void draw(){ cout << ““LineLine\nn””; }; }
Polymorphism & Arrays
Polymorphism & Arrays
int main() {
int main() {
Point p1(10, 10), p2(20, 20), Point p1(10, 10), p2(20, 20), ……
Line _line[ 10 ];
Line _line[ 10 ];
_line[ 0 ] = Line( p1, p2 ); _line[ 0 ] = Line( p1, p2 );
_line[ 1 ] = Line( p3, p4 );
_line[ 1 ] = Line( p3, p4 );
drawShapes( _line, 10 );
drawShapes( _line, 10 );
return 0; return 0;
Because
Because
Line Array
Shape Array
_shape[ i ].draw();
*(_shape + (i * sizeof(Shape))).draw();
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