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// Assign dynamically allocated derived class objects to base class pointers
// and use polymorphism to display output based on the type of the object.
#include <iostream>
#include <iomanip>
#include <vector>
using namespace std;
// base class Employee
class Employee
{
private:
// employee ID
int empID;
public:
// Constructor that will take an int as an argument and
// assign it to empID
Employee(int);
// Destructor
~Employee();
// Return the empID
int getEmpID() const;
// pure virtual function
virtual void printPay() = 0;
};
// Constructor that will take an int as an argument and
// assign it to empID
Employee::Employee(int empID)
{
this->empID = empID;
}
// Destructor
Employee::~Employee()
{
}
// Return the empID
int Employee::getEmpID() const
{
return empID;
}
// derived class HourlyEmployee
class HourlyEmployee : public Employee
{
public:
// Constructor that will take in three arguments: The employee
// id, the number of hours worked, and the pay rate.
HourlyEmployee(int, double, double);
// Destructor
~HourlyEmployee();
// Return the hours
double getHours() const;
// Return the payRate
double getPayRate() const;
// Print the hourly employee's id and the weekly pay with 2 digits
// after the decimal place.
void printPay();
private:
// number of hours worked
double hours;
// pay rate
double payRate;
};
// Constructor that will take in three arguments: The employee
// id, the number of hours worked, and the pay rate.
HourlyEmployee::HourlyEmployee(int empID, double hours, double payRate)
: Employee(empID)
{
this->hours = hours;
this->payRate = payRate;
}
// Destructor
HourlyEmployee::~HourlyEmployee()
{
}
// Return the hours
double HourlyEmployee::getHours() const
{
return hours;
}
// Return the payRate
double HourlyEmployee::getPayRate() const
{
return payRate;
}
// Print the hourly employee's id and the weekly pay with 2 digits
// after the decimal place.
void HourlyEmployee::printPay()
{
// calculate weekly pay
double weeklyPay = hours * payRate;
// set floating point output to 2 digits after the decimal place
cout << fixed << showpoint << setprecision(2);
cout << "The pay for the hourly employee with ID number ";
cout << getEmpID() << " is $" << weeklyPay << endl;
}
// derived class SalariedEmployee
class SalariedEmployee : public Employee
{
public:
// Constructor that will take in two arguments: The employee id and
// the salary.
SalariedEmployee(int, double);
// Destructor
~SalariedEmployee();
// Return the salary
double getSalary() const;
// Print the salaried employee's id number and the weekly pay with
// 2 digits after the decimal place.
void printPay();
private:
// salary
double salary;
};
// Constructor that will take in two arguments: The employee id and
// the salary.
SalariedEmployee::SalariedEmployee(int empID, double salary) : Employee(empID)
{
this->salary = salary;
}
// Destructor
SalariedEmployee::~SalariedEmployee()
{
}
// Return the salary
double SalariedEmployee::getSalary() const
{
return salary;
}
// Print the salaried employee's id number and the weekly pay with
// 2 digits after the decimal place.
void SalariedEmployee::printPay()
{
// calculate the weekly pay
double weeklyPay = salary / 52;
// set floating point output to 2 digits after the decimal place
cout << fixed << showpoint << setprecision(2);
cout << "The pay for the salaried employee with ID number ";
cout << getEmpID() << " is $" << weeklyPay << endl;
}
// function prototypes
void getInput(vector <Employee *> & Ve);
void printList(const vector <Employee *> & Ve);
int main()
{
vector <Employee *> VEmp;
getInput(VEmp);
printList(VEmp);
system("pause");
return 0;
}
// Contain a loop that will give the user an option to enter information
// about an hourly employee or a salaried employee. Depending on the user's
// choice, collect the appropriate input information from the user and use
// this information to dynamically construct a derived class object. Assign
// the address of the dynamically created derived class object to an element
// of the Ve vector.
void getInput(vector <Employee *> & Ve)
{
// employee id
int empID;
// number of hours worked
double hours;
// pay rate
double payRate;
// salary
double salary;
// user's choice
int option;
// do until option 3 is entered
do
{
// display options
cout << "Enter 1 for Hourly Employee" << endl;
cout << "Enter 2 for Salaried Employee" << endl;
cout << "Enter 3 to stop: ";
// read option
cin >> option;
cout << endl;
// process option
switch (option)
{
case 1:
// read employee ID
cout << "Enter the ID: ";
cin >> empID;
// read number of hours worked
cout << "Enter the number of hours worked: ";
cin >> hours;
// read pay rate
cout << "Enter the pay rate: ";
cin >> payRate;
// dynamically construct a HourlyEmployee object and
// push back into vector
Ve.push_back(new HourlyEmployee(empID, hours, payRate));
break;
case 2:
// read employee ID
cout << "Enter the ID: ";
cin >> empID;
// read salary
cout << "Enter the salary: ";
cin >> salary;
// dynamically construct a SalariedEmployee object and
// push back into vector
Ve.push_back(new SalariedEmployee(empID, salary));
break;
case 3:
break;
default:
cout << "Error: invalid option" << endl;
}
cout << endl;
} while (option != 3);
}
// Loop through the elements of the Ve vector and call the printPay() function
// of each of the dynamically allocated objects.
void printList(const vector <Employee *> & Ve)
{
for (size_t i = 0; i < Ve.size(); i++)
{
Ve[i]->printPay();
}
}
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