Question

Programming Language C++

Task 1: Write a program to calculate the volume of various containers. A base class, Cylinder, will be created, with its derived classes, also called child classes or sub-classes.

First, create a parent class, Cylinder. Create a constant for pi since you will need this for any non-square containers. Use protected for the members. Finally, create a public function that sets the volume.

// The formula is: V = pi * (r^2) * h

Task 2: Create a derived, or child class for Cylinder, that is, a Cone class. The same function, with the same parameters, is used. However, the formula is different for a cone.

// The formula is: V = (1/3) * pi * (r^2) * h

Task 3: Test your classes in the main function by creating an instance of Cone and an instance of Cylinder. In each case, call the set_volume function, passing the same parameters.

Task 4: Create a derived class for Cone called PartialCone. Add a second radius variable with scope specific to this class (because the top and bottom radii of a partial cone are different). Redefine the set_volume function.

The formula for the volume of a partial/truncated cone is:

• V = h * (PI / 3) * (R² + (R * r) + r² )
• V = volume
• R = base radius
• r = top surface radius

Task 5:

1. What happens if you change the access modifiers for Cylinder's variables to private?
2. Consider that you declare a private variable in the Cone class. Can you reference it in Cylinder?

Answer 1

Code:

#include <iostream>

using namespace std;

// Cylinder class

class Cylinder{

protected:

const float pi=3.14;

float volume;

public:

void set_volume(int r,int h){

volume=pi*(r*r)*h;

}

float get_volume(){

return volume;

}

};

// derived class cone from cylinder

class Cone : public Cylinder{

public:

void set_volume(int r,int h){

volume=pi*(r*r)*h*0.34;

}

};

int main() {

Cone c1;

c1.set_volume(30, 40);

cout<<"Volume of Cone c1 with r=3, h=4 is "<<c1.get_volume()<<endl;

Cylinder c2;

c2.set_volume(30, 40);

cout<<"Volume of Cylinder c2 with r=3, h=4 is "<<c2.get_volume()<<endl;

}

Output:

Volume of Cone c1 with r=30, h=40 is 38433.6
Volume of Cylinder c2 with r=30, h=40 is 113040

Please post the other parts as another question. Thank you.