Question

C++

Derive the cylinder class from the base circle class. Assume the circle class has a protected member variable representing the radius called radius and declared as a double with a default value of 1.0. It also has a public function called calcVal that evaluates the area of a circle as PI * radius * radius where PI is a constant 3.14. In your derived class include an additional protected member representing the length of the cylinder. Call this variable length. Have the default values for the cylinder class be 1 for both the radius and the length. For this derived cylinder class include a public function calcVal that evaluates the volume of the cylinder. (Hint: The volume of the cylinder is length * circle :: calcVal) Output: Provide a detailed description of the process that took place in developing the solution to the above-mentioned question.

Answer 1

CODE:

#include <iostream>

#include <cmath>

#include <iomanip>

using namespace std;

// Creating Circle class

class Circle

{

// Declaring variable

private:

double radius;

public:

static const double PI=3.1415926;

// Zero argumented constructor

Circle()

{

}

// Parameterized constructor

Circle(double radius)

{

this->radius = radius;

}

// getters and setters

double getRadius()

{

return radius;

}

void setRadius(double radius)

{

this->radius = radius;

}

// This method will calculate the Area of the Circle

double calArea()

{

return PI * radius * radius;

}

// This function will calculate the Circumference of the Circle

double calCircumference()

{

return 2 * PI * radius;

}

};

// Creating Cylinder class deriving from Circle class

class Cylinder : public Circle

{

private:

// Declaring variable

double height;

public:

// Zero argumented constructor

Cylinder()

{

}

// Parameterized constructor

Cylinder(double radius, double height)

: Circle(radius)

{

// super(radius);

this->height = height;

}

// Setters and getters

double getHeight()

{

return height;

}

void setHeight(double height)

{

this->height = height;

}

// This function will calculate the Volume of the Cylinder

double calVolume()

{

return Circle::calArea()* height;

}

// This function will calculate the Area of the Cylinder

double calArea()

{

return calCircumference()*(height+getRadius()) ;

}

};

int main()

{

// declaring varibles

double radius1, height1, radius2, height2;

cout << "Test Circle class constructor and area() function:" << endl;

  

Circle cir1(10);

cout<<"Circle cir1: radius="<<cir1.getRadius()<<endl;

cout<<"area of cir1 = "<<cir1.calArea()<<endl;

  

cout<<endl;

cout << "Test set and get methods for class Circle:" << endl;

Circle cir2(12);

cout<<"Circle cir2: radius="<<cir2.getRadius()<<endl;

cout<<"get data members for cir2: "<<cir2.getRadius()<<endl;

  

cout<<endl;

cout << "Test Cylinder class constructor, area(), and volume() functions:" << endl;

// Creating the CylinderType class object

Cylinder cyl1(20, 30);

cout << "Cylinder cyl1: radius="<<cyl1.getRadius()<<" height="<<cyl1.getHeight()<<endl;

cout<<"area of cyl1 = "<<cyl1.calArea()<<endl;

cout<<"volume of cyl1 = "<<cyl1.calVolume()<<endl;

  

  

  

// Creating the CylinderType class object

Cylinder cyl2(40,50);

cout<<endl;

cout << "Test set and get methods for class Cylinder:" << endl;

cout<<"Cylinder cyl2: radius="<<cyl2.getRadius()<<" height="<<cyl2.getHeight()<<endl;

cout<<"get data members for cyl2: "<<cyl2.getRadius()<<", "<<cyl2.getHeight()<<endl;

  

return 0;

}

____________________

Output: