Calculate area & Perimeter of circle using all kinds of constructor & destructor.

Explanation

The area enclosed by a circle is π multiplied by the radius squared

Area = π*r*r  

Perimeter of circle

C= 2πr

#include<iostream.h>

#include<conio.h>

Class circle

{

          Float r;

          Float area,peri;

Public:

          Circle()

          {

                   r=10;

          }

          Circle(int a)

          {

                   r=a;

          }

          Void calc()

          {

                   Area=3.14*r*r;

                   Peri=2*3.14*r;

          }

Void display()

          {

                   Cout<<”\n area of cricle :”<<area;

                   Cout<<”\n Perimeter of circle :”<<peri;

          }

          ~circle()

          {

                   Delete r;

                   Delete area;

                   Delete peri;

          }

};

Void main()

{

            Circle c;

            Cout<<’\n Constructors Without Parameters ;”;

c.calc();

            c.display();

            Circle c2(6.5);

            Cout<<”\n Constructors with parameters :”;

            C2.calc();

            C2.display();

}