29(5 points). What is the output of the above program? #include <iostream> #incl

Question

29(5 points). What is the output of the above program?

#include <iostream>

#include <cmath>

using namespace std;

int main()

{

      Circle circle1;

      Circle circle2;

      circle2.setRadius(2.5);

      cout << "The area of circle1 is " << circle1.getArea() << endl;

      cout << "The area of circle2 is " << circle2.getArea() << endl;

      return 0;

}

--Circle.h ------

#include <iostream>

#include <cmath>

using namespace std;

// Circle class declaration

class Circle

{ private:

         double radius;

   public:             // Member function prototypes

         Circle();

         void setRadius(double);

         double getArea();        

};

30(5 points). What is the output of the above program?

Explanation / Answer

main.cpp
#include <iostream>

#include <cmath>
#include "Circle.h"
using namespace std;

int main()

{
      Circle circle1;

      Circle circle2;

      circle2.setRadius(2.5);

      cout << "The area of circle1 is " << circle1.getArea() << endl;

      cout << "The area of circle2 is " << circle2.getArea() << endl;

      return 0;

}

Circle.cpp
#include "Circle.h"

// Construct a circle object
Circle::Circle()
{
radius_ = 1;
}

// Construct a circle object
Circle::Circle(double newRadius)
{
radius_ = newRadius;
}

// Return the area of this circle
double Circle::getArea()
{
return radius_ * radius_ * 3.14159;
}

// Return the radius of this circle
double Circle::getRadius()
{
return radius_;
}

// Set a new radius
void Circle::setRadius(double newRadius)
{
radius_ = (newRadius >= 0) ? newRadius : 0;
}

Circle.h
// radius --> private
// getter/setter
class Circle
{
public:
Circle();
Circle(double);
double getArea();
double getRadius();
void setRadius(double);

private:
double radius_;
};

sample output

The area of circle1 is 3.14159                                                                                                                              
The area of circle2 is 19.6349                                                                                                                              

Demo.cpp
#include <iostream>

using namespace std;

class Demo

{
   public:

      Demo();       // Constructor prototype

     ~Demo();       // Destructor prototype

};

Demo::Demo()        // Constructor function definition

{ cout << " the constructor" << " is running. ";

}
Demo::~Demo()       // Destructor function definition

{ cout << "Now the destructor is running. ";

}
int main()

{
   Demo demoObj;    // Declare a Demo object;
   return 0;

}

sample output

the constructor is running.                                                                                                                                
Now the destructor is running.

manager.h

#ifndef _MANAGER_H
#define _MANAGER_H

#include "employee.h"

class Manager : public Employee {
public:
Manager(string theName,
          float thePayRate,
          bool isSalaried);

bool getSalaried() const;
void setSalaried(bool theSalaried);

float pay(float hoursWorked) const;

protected:
bool salaried;
};

#endif /* not defined _MANAGER_H */

manager.cpp

#include "manager.h"

Manager::Manager(string theName,
                 float thePayRate,
                 bool isSalaried)
: Employee(theName, thePayRate)
{
salaried = isSalaried;
}

bool Manager::getSalaried() const
{
return salaried;
}

void Manager::setSalaried(bool theSalaried){
   salaried = theSalaried;
}

float Manager::pay(float hoursWorked) const
{
if (salaried)
    return payRate;
/* else */
return Employee::pay(hoursWorked);
}

employee.h

using namespace std;

#ifndef _EMPLOYEE_H
#define _EMPLOYEE_H

#include <string>

class Employee {
public:
Employee(string theName, float thePayRate);

string getName() const;
float getPayRate() const;
void setName(string theName);
void setPayRate(float thePayRate);

float pay(float hoursWorked) const;

protected:
string name;
float payRate;
};

#endif /* not defined _EMPLOYEE_H */

employee.cpp

#include "employee.h"

Employee::Employee(string theName, float thePayRate)
{
name = theName;
payRate = thePayRate;
}

string Employee::getName() const
{
return name;
}

float Employee::getPayRate() const
{
return payRate;
}

float Employee::pay(float hoursWorked) const
{
return hoursWorked * payRate;
}

void Employee::setName(string theName){
   name = theName;
}

void Employee::setPayRate(float thePayRate){
   payRate = thePayRate;
}

main.cpp
                                                                                                                              

#include <iostream>
#include "employee.cpp"
#include "manager.cpp"

int main()
{
Employee empl("John Burke", 25.0);
Manager mgr("Jan Kovacs", 1200.0, true);

// Assume all employees worked 40 hours this period.

cout << "For Employee:" << endl;
cout << "Name: " << empl.getName() << endl;
cout << "Pay: " << empl.pay(40.0) << endl;

cout << "Changing the Employee's name..." << endl;
empl.setName("Doug Conners");
cout << "New Name: " << empl.getName() << endl;

cout << endl;
cout << "For Manager:" << endl;
cout << "Name: " << mgr.getName() << endl;
cout << "Salaried: " << mgr.getSalaried() << endl;
cout << "Pay: " << mgr.pay(40.0) << endl;

cout << "Changing the Manager's salaried status..." << endl;
mgr.setSalaried(false);
cout << "New Pay: " << mgr.pay(40.0) << endl;

return 0;
}

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