3. In the program figurespointers we have a base class location and various derived classes:

circle, triangle, rectangle. Complete the implementation of the derived classes.

For marking purposes, run the program entering: circle(1,2,3), triangle(3,4,1,2,1) and rectangle(5,6,3,4). Explain why this program does not work properly.

Change the classes (not main) so that the program runs properly and run the program with the same data as before.

Declaration of Classes FigurePointers

This is the copy paste code for this code: Declaration of Classes Figure Pointers:

/* File: figurepointers.h

*/

#ifndef FIGUREPOINTERS_H

#define FIGUREPOINTERS_H

#include

#include

#include

#include

using namespace std;

class location {

private:

float x; // position of the figure

float y;

public:

void read(istream & in) ;

void write(ostream & out) const;

virtual float area(void) const;

};

class circle : public location {

private:

float radius;

public:

void read(istream & in);

void write(ostream & out) const;

float area(void) const; // area of the figure;

};

class rectangle : public location {

private:

float side1, side2;

public:

void read(istream & in);

void write(ostream & out) const;

float area(void) const; // area of the figure;

};

class triangle : public rectangle {

private:

float angle;

public:

void read(istream & in);

void write(ostream & out) const;

float area(void) const; // area of the figure;

};

#endif /* FIGUREPOINTERS_H */

Implementation of Class FigurePointers:

/* File: figurepointers.cpp

Implementation of class figurepointers */

#include "figurepointers.h"

////////////////// implementation of location /////// ///////////

void location::read(istream & in)

{

cout

in >> x;

cout

in >> y;

}

float location::area(void) const

{

return 0.0;

}

void location::write(ostream & out) const

{

out

out

out

}

////////////////// implementation of circle //////////////////

////////////////// implementation of triangle //////////////////

////////////////// implementation of rectangle //////////////////

Main Program Using Classes FigurePointers:

/* File: testfigurepointers.cpp

Application program using classes figurepointers

Programmer: your name Date: */

#include "figurepointers.h"

int main(void)

{

string type; // figure type

ofstream fout ("testfigurepointersout.txt");

location * p;

while(true) { // loop until break occurs

cout > type;

if(type == "circle") {

p = new circle;

p->read(cin);

fout

p->write(fout);

delete p;

} else if (type == "triangle") {

p = new triangle;

p->read(cin);

fout

p->write(fout);

delete p;

} else if (type == "rectangle") {

p = new rectangle;

p->read(cin);

fout

p->write(fout);

} else break; // we are done entering data

}

fout.close();

return 0;

}

Declaration of Classes FigurePointers \#endif /* FIGUREPOINTERSH */ Implementation of Classes FigurePointers /* File: figurepointers. cpp Implementation of class figurepointers */ \#include "figurepointers.h" void location:: read (istream \& in) \{ cout