Write a new version of the area calculation program from Assessment 3 that makes use of inheritance in C++. Add a new Shape base class to the area calculation program that includes data members common to all shapes (such as a shape ID, a shape type, and a unit of measure). The Shape base class should also include a virtual getArea() member function. Revise the Circle and Square classes so that they inherit from the Shape base class. Add a third shape to the program that also inherits from the Shape class. The finished program should ask the user to enter the relevant information for each shape and then print the area and other information for each shape. Organize the code correctly into header (.h) and implementation (.cpp) files. Your code should include meaningful comments and be correctly formatted.

Area calculation program from Assessment 3 code:

CODE :

circle.h :

#ifndef CIRCLE_H #define CIRCLE_H

struct Circle { // circle structure class

public: Circle(); // declaration void setRadius(double r); // setting the radius double getRadius(); // getting the radius double Area(); // get the area calculated void Display(); // display the datda

protected: double Radius; // radius value declared

private:

};

#endif

square.h :

#ifndef SQUARE_H #define SQUARE_H

struct Square { // square structure class

public : Square(); // declaration void setLength(double l); // setting the length double getLength(); // getting the length double Area(); // get the area calculated void Display(); // display the data

protected : double Length; // length value declaration

private: };

#endif

circle.cpp :

#include #include "circle.h"

using namespace std;

const double PI = 3.14159; // initialisng the global values Circle::Circle() { // method declaration

Radius = 0; // initialisng the radius value

}

void Circle::setRadius(double r) {

Radius = r <= 0 ? 1 : r; // checking the input value

}

double Circle::getRadius() {

return Radius; //getting and setting the value

}

double Circle::Area(){ return Radius * Radius * PI; // returning the area }

void Circle::Display(){ // display the data

cout << " Circle Properties"; cout << " Radius = " << getRadius(); cout << " Area = " << Area() << " "; }

square.cpp :

#include #include "square.h"

using namespace std;

Square::Square(){ // method declaration

Length = 0; // length initialisng

}

void Square::setLength(double l) {

Length = l <= 0 ? 1 : l; // checking the data

}

double Square::getLength() {

return Length; // returning the length

}

double Square::Area() {

return Length*4; // returning the area

} void Square::Display(){ // display the data

cout << " Square Properties"; cout << " Length = " << getLength(); cout << " Area = " << Area() << " "; }

main.cpp :

#include "circle.h" #include #include "square.h" // including the header files

using namespace std;

int main(){

int radius,length;

Circle circle; // Displaying a circle using the default value of the radius circle.Display(); Circle circ; // circle with a value supplied for the radius

cout << "Enter the radius value :" << endl; // taking the value from the user cin >> radius;

circ.setRadius(radius); circ.Display();

Square square; // Displaying a square square.Display(); Square squ; // square with a value supplied for the length

cout << "Enter the length value :" << endl; cin >> length;

squ.setLength(length); // of the base class squ.Display();

return 0; }