How to Calculate Circle Area using Object Oriented Programming | Calculate Area of Circle

 In This Post We Learn How to Calculate Circle Area using Classes and Objects . Different Concept of Polymorphism and Abstract Classes

Source Code Program

#include <iostream>  
using namespace std;
class shape
{
 protected:
       double x,y;
  public:
       virtual void get_data()=0;
       virtual void display_area()=0;
};
class circle:public shape{
public:
    void get_data()
    {
       cout<<"\n=====Data Entry for Circle=====\n";
       cout<<"Enter Radius of circle  : ";
       cin>>x;
    }
    void display_area(void)
    {
       cout<<"\n=====Area of Circle=====\n";
       double aoc;
       aoc = 3.14 * x * x; //area = 3.14*radius*radius
       cout<<"Area of circle is "<<aoc<<endl;
    }
};
main(){
    circle crl;
    shape *list;    
    list=&crl;
    list->get_data();
    list->display_area();
     
}

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