Question

C++ problem 11-3

Chapter 10 defined the class circleType to implement the basic properties of a circle. (Add the function print to this class to output the radius, area, and circumference of a circle.) Now every cylinder has a base and height, where the base is a circle. Design a class cylinderType that can capture the properties of a cylinder and perform the usual operations on the cylinder. Derive this class from the class circleType designed in Chapter 10. Some of the operations that can be performed on a cylinder are as follows: calculate and print the volume, calculate and print the surface area, set the height, set the radius of the base, and set the center of the base. Also, write a program to test various operations on a cylinder. Assume the value of \piπ to be 3.14159.

main.cpp , cylinderType.h and cylinderTypeImp.cpp are blank

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For circleType.h

//circleType.h

#ifndef circleType_H

#define circleType_H

class circleType

{

public:

    void print();

void setRadius(double r);

      double getRadius();

     double area();

      double circumference();

     circleType(double r = 0);

      private:

    double radius;

};

#endif

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For circleTypeImp.cpp

//circleTypeImp.cpp

//Implementation File for the class circleType

#include <iostream>

#include "circleType.h"

using namespace std;

void circleType::print()

{

    cout << "Radius = " << radius

         << ", area = " << area()

         << ", circumference = " << circumference();

}

void circleType::setRadius(double r)

{

    if (r >= 0)

        radius = r;

    else

        radius = 0;

}

double circleType::getRadius()

{

    return radius;

}

double circleType::area()

{

    return 3.1416 * radius * radius;

}

double circleType::circumference()

{

    return 2 * 3.1416 * radius;

}

circleType::circleType(double r)

{

    setRadius(r);

}

Answer 1

Setup:

1) Make sure to place all the five files(circleType.h, circleTypeImp.cpp, cylinderType.h, cylinderTypeImp.cpp, main.cpp) in the same folder to avoid any linking errors.

2) When the files are all set-up, first compile the files together, to link them without errors, and then execute the executable file that is generated:

Compile and Link: g++ main.cpp cylinderType.cpp circleTypeImp.cpp
Execute: ./a.out

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Here is the code (with comments to explaining the logic ):

1. cylinderType.h

2. CylinderTypeImp.cpp

3. main.cpp

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Here is the output:

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Here is the same code (Without comments, for better readability):

1. cylinderType.h

2. CylinderTypeImp.cpp

3. main.cpp

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Here is the same code (available to copy-paste onto your compiler/text-editor for fast testing):

1. cylinderType.h

 #ifndef cylinderType_H #define cylinderType_H #include "circleType.h" class cylinderType : public circleType { private: double height, radius, x, y; public: void print(); void setRadius(double r); double getRadius(); void setHeight(double h); double getHeight(); void setCenter(double a, double b); double surfaceArea(); double volume(); cylinderType(double x = 0, double y = 0, double r = 0, double h = 0); }; #endif 

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2. CylinderTypeImp.cpp

 #include <iostream> #include "cylinderType.h" using namespace std; void cylinderType::print() { cout << "Radius = " << radius << ", Height = " << height << ", Center = (" << x << ", " << y << ") " << ", Surface Area = " << surfaceArea() << ", Volume = " << volume() << "\n\n"; } void cylinderType::setRadius(double r) { if (r >= 0) radius = r; else radius = 0; } double cylinderType::getRadius() { return radius; } void cylinderType::setHeight(double h) { if (h >= 0) height = h; else height = 0; } double cylinderType::getHeight() { return height; } void cylinderType::setCenter(double a, double b) { x = a; y = b; } double cylinderType::surfaceArea() { circleType base(radius); double base_area = base.area(); double curved_surface_area = base.circumference() * height; return 2 * base_area + curved_surface_area; } double cylinderType::volume() { circleType base(radius); double volume = base.area() * height; return volume; } cylinderType::cylinderType(double r, double h, double x, double y) { setRadius(r); setHeight(h); setCenter(x, y); }

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3. main.cpp

 #include <iostream> #include "cylinderType.h" using namespace std; int main() { cylinderType cylinder1(10, 10, 0, 0); cylinder1.print(); cylinder1.setCenter(1, 1); cylinder1.print(); cylinder1.setHeight(20); cylinder1.print(); cylinder1.setRadius(20); cylinder1.print(); double surfaceArea = cylinder1.surfaceArea(); double volume = cylinder1.volume(); cout << "surface Area = " << surfaceArea << ", Volume = " << volume << endl; } 

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