Question

Create a program that calculates the area of various shapes.

Console

The Area Calculator Circle, square, or rectangle? (c/s/r): c Enter radius: 15 Area: 706.858 Continue? (y/n): y circle, square, or rectangle? (c/s/r):r Enter width 15 Enter height: 20 Area: 300 continue? (y/n): n Bye!

Specifications

• Create an abstract class named Shape. This class should contain virtual member function named get_area() that returns a double type.
• Create a class named Circle that inherits the Shape class and contains these constructors and member functions:
  • Circle(double radius)
  • double get_radius()
  • void set_radius(double radius)
  • double get_area()
• Create a class named Square that inherits the Shape class and contains these constructors and member functions:
  • Square(double width)
  • double get_width()
  • void set_width(double width)
  • double get_area()
• Create a class named Rectangle that inherits the Square class and contains these constructors and member functions:
  • Rectangle(double width, double height)
  • double get_height()
  • void set_height(double height)
  • double get_area()
• Use the following formulas to calculate area:
  • Circle: Area = radius² * pi
  • Square: Area = width²
  • Rectangle: Area = width * height
• In the main.cpp class, use a function named display_area() to display the area of each shape.
• Use the console namespace presented in chapter 7, p.274~277, to get and validate the user’s entries.

Answer 1

#include<iostream>
using namespace std;
//abstract class
class Shape
{
  
   virtual double get_area()=0;//returns double type
};

class Circle:Shape
{
  
   double radius;
   //constructor
   public:
   Circle(double r)
   {
       radius=r;
   }
   double get_radius()
   {
       return radius;
   }
   void set_radius(double r)
   {
           radius=r;
   }
  
   double get_area()
   {
       return 3.14*radius*radius;//returning area  
   }
};

class Square:Shape
{
   double width;
   //constructor
   public:
   Square(double w)
   {
       width=w;
   }
   double get_width()
   {
       return width;
   }
   void set_width(double w)
   {
           width=w;
   }
  
   double get_area()
   {
       return width*width;//returning area  
   }      
  
};

class Rectangle:Shape
{
   double width,height;
   //constructor
   public:
   Rectangle(double w,double h)
   {
       width=w;
       height =h;
   }
   double get_width()
   {
       return width;
   }
   void set_width(double w)
   {
           width=w;
   }
   double get_height()
   {
       return height;
   }
   void set_height(double h)
   {
           height=h;
   }
  
   double get_area()
   {
       return width*height;//returning area  
   }      
  
};
//method to display area of each shape
void display_area()
{
   double r;
   double w,h;
  
   cout<<"Enter circle radius :";
   cin>>r;
   Circle *c= new Circle(r);
   cout<<"Area of circle :"<<c->get_area()<<endl;
  
   cout<<"Enter Square width :";
   cin>>w;
   Square *s= new Square(w);
   cout<<"Area of Square :"<<s->get_area()<<endl;
  
   cout<<"Enter Rectangel width :";
   cin>>w;
   cout<<"Enter Rectangel height :";
   cin>>h;
   Rectangle *R= new Rectangle(w,h);
   cout<<"Area of Rectangle :"<<R->get_area()<<endl;
  
  
  
  
  
}
int main()
{
  
   display_area();
   return 0;
}

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