Question

Study the file polygon.h. It contains the header file for a class of regular polygons. Implement the methods, and provide a driver to test it. It should be in C++

Write a polygon.h file with given instructions for the polygon.cpp file

#include <iostream>
#include <math.h>
using namespace std;
#ifndef M_PI
# define M_PI 3.14159265358979323846
#endif
int main()
{
   float areaP, length, sides;
   cout << "\n\n Polygon area program.\n";
   cout << "---------------------------------\n";
   cout << " Enter the number of sides: ";
   cin >> sides;
   cout << " Enter the length of one side: ";
   cin >> length;
   areaP = (sides * (length * length)) / (4.0 * tan((M_PI / sides)));
   cout << " The area of the ploygon is: " << areaP << "\n";
   cout << " Done..." << endl;
       system("pause");
   return 0;

}

Also include suitable methods and write a code to provide a driver to test it.

Answer 1

Polygon.h

#include <iostream>

#include <sstream>

#include <cmath>

# define M_PI 3.14159265358979323846

using namespace std;

class Polygon

{

private:

int numSides;

float sideLength;

public:

Polygon();

Polygon(int, float);

int getNumberOfSides();

float getSideLength();

float getArea();

string toString();

};

Polygon.cpp

#include "Polygon.h"

Polygon::Polygon()

{

this->numSides = 0;

this->sideLength = 0.0f;

}

Polygon::Polygon(int sides, float len)

{

this->numSides = sides;

this->sideLength = len;

}

int Polygon::getNumberOfSides(){ return this->numSides; }

float Polygon::getSideLength(){ return this->sideLength; }

float Polygon::getArea()

{

return (numSides * (sideLength * sideLength)) / (4.0 * tan((M_PI / numSides)));;

}

string Polygon::toString()

{

stringstream ss;

ss << "Number of sides: " << this->numSides << endl << "Length of each side: " << this->sideLength << " units" << endl << "Area: " << getArea() << " sq. units" << endl;

return ss.str();

}

main.cpp

#include "Polygon.h"

int main()

{

int numOfSides;

float sideLength;

cout << "\n\n Polygon area program.\n";

cout << "---------------------------------\n";

cout << " Enter the number of sides: ";

cin >> numOfSides;

cout << " Enter the length of one side: ";

cin >> sideLength;

Polygon polygon(numOfSides, sideLength);

cout << endl << polygon.toString() << endl;

}

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