Write a class Quadrilateral that has: 4 Variables representing the length of the

Question

Write a class Quadrilateral that has:

4 Variables representing the length of the 4 sides

A function that returns the perimeter of the quadrilateral.

Any other necessary accessor methods you find needed to complete this assignment.

Write a subclass Rectangle that:

Has a variable that represents the length of the diagonal.

Has a function that calculates the area.

Has a function that returns the diagonal.

Write a subclass Trapezoid that:

Has a function that calculates the area.

Has a boolean function that tells whether the Trapezoid is an isosceles trapezoid (two of the sides are equal).

Write a main that tests all three classes.

Help with this C++ problem

Explanation / Answer

Answer:

//inheritance program for Quadrilateral

#include <iostream>

#include <cmath>

#include<cstdlib>

using namespace std;

//class Quadrilateral

class Quadrilateral

{

//four variables for 4 sides

protected:

     double side1,side2,side3,side4;

public:

//constructor

     Quadrilateral(double s1,double s2,double s3,double s4)

          : side1(s1), side2(s2), side3(s3), side4(s4) {}

     Quadrilateral() {}

//get the perimeter

     double getPerimeter()

     {

          return (side1+side2+side3+side4);

     }   

};

// class Rectangle is inherited from Quadrilateral

class Rectangle: public Quadrilateral

{

//has variable for diagonal

   protected:

          double diagonal;

public:

Rectangle(double s1,double s2)

          : Quadrilateral(s1,s2,s1,s2) { diagonal =0; }

//calculate the area

double getArea()

{

return (side1*side2);

}

//calculate the diagonal

double getDiagonal()

{

diagonal=sqrt((side1*side1)+(side2*side2));

return diagonal;

}

};

// class Trapezoid is inherited from Quadrilateral

class Trapezoid: public Quadrilateral

{

public:

Trapezoid(double s1,double s2,double s3,double s4)

          : Quadrilateral(s1,s2,s3,s4) { }

//return the area of the Trapezoid

double getArea()

{

double temp1,temp2;

temp1=(side1+side2-side3+side4)*(side1-side2-side3+side4)*(side1+side2-side3-side4)*(side2+side4-side1+side3);

temp2=(side1+side3)/(4*(side1-side3));

return (temp1*temp2);

}

//check Trapezoid is isoceless

bool isIsoceless()

{

if(side2==side4)

return true;

return false;

}

};

//main method

int main()

{

//create object for Quadrilateral

Quadrilateral quad(10,20,30,40);

//print the Quadrilateral perimeter

cout<<"   QUADRILATERAL PERIMETER:"<<quad.getPerimeter()<<endl;

//create object for Rectangle

Rectangle rec(10,20);

cout<<"   RECTANGLE AREA:"<<rec.getArea()<<endl;

cout<<"   RECTANGLE DIAGONAL:"<<rec.getDiagonal()<<endl;

Trapezoid trap(10,20,20,30);

cout<<"TRAPEZOID AREA:"<<trap.getArea()<<endl;

cout<<"   IS TRAPEZOID Isoceless:"<<trap.isIsoceless()<<endl;

return 0;

}//main ends

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