program to find the area and circumference of circle using classes

#include<iostream.h>
#include<conio.h>
class circle
{
 float r;
 public:
 void setdata();
 void area();
 void circum();
 };
 void circle::setdata()
 {cout<<"enter the radius of circle  ";
  cin>>r;
 }
 void circle::area()
 {  double area;
    area=3.14*r*r;
    cout<<"area of circle "<<area<<endl;
  }
 void circle::circum()
 {  double cir;
    cir=2*3.14*r;
    cout<<"circumference of circle is "<<cir<<endl;
  }
  void main()
  { clrscr();
   circle c1,c2;
    c1.setdata();
    cout<<"for first circle"<<endl;
    c1.area();
    c1.circum();
    cout<<"for second circle"<<endl;
    c2.setdata();
    c2.area();
    c2.circum();
    getch();
    }