// User-defined exception class.

#include

#include

using namespace std;

class negativeNumber

{

public:

negativeNumber()

{

message = "this Number cannot be negative";

}

negativeNumber(string str)

{

message = str + " cannot be negative";

}

string what()

{

return message;

}

private:

string message;

};

//////////////////////////////main////////////////

#include

#include

#include "cylinderType.h"

using namespace std;

int main()

{

cylinderType cylinderObject;

double userHeight;

double userRadius;

cout << " enter the height of the cylinder: ";

cin >> userHeight;

cout << " enter the radius: ";

cin >> userRadius;

cylinderObject.setDimension(userHeight, userRadius);

cout << fixed << showpoint << setprecision(2);

cout << " Cylinder dimensions: ";

cylinderObject.print();

cout << endl;

cout << "Volume: "

<< cylinderObject.volume() << endl;

return 0;

}

////////////////////////headerfile//////////////////////

#ifndef _cylinderType_h_

#define _cylinderType_h_

class cylinderType {

public:

void setDimension(double h, double r);

double volume() const;

void print() const;

cylinderType();

private:

double height;

double radius;

};

#endif

//////////////////////////////cppfile/////////////////////

#include

#include

#include "cylinderType.h"

using namespace std;

const double pi = 3.1416;

void cylinderType::setDimension(double h, double r)

{

height = h;

if (r >= 0)

radius = r;

else

radius = 0;

}

double cylinderType::volume() const

{

return pi * pow(radius, 2) * height;

}

void cylinderType::print() const

{

cout << "height = " << height

<< "; radius = " << radius;

}

cylinderType::cylinderType()

{

cout << "*****************************************************************" << endl;

cout << "* Volume and Surface Area of a Cylinder *" << endl;

cout << "***************************************************************** " << endl;

}

Modify the cylinderType and its client (main) program such that negativeNumber class can be incorporated into them and the associated exception can be properly handled.