Constructors ques 4

#include<iostream.h>
#include<conio.h>
class circle
{ int r;
float area;
public: circle(int radius)
{ r=radius;
area=3.14*r*r;
}
circle(circle &c1)
{ r=c1.r+1;
area=3.14*r*r;
}
void display()
{ cout<<"radius "<<r<<endl;
cout<<"area "<<area<<endl;
}
};
void main()
{ clrscr();
int r;
cout<<"enter radius";
cin>>r;
circle c1(r);
circle c2(c1);
cout<<"circle 1 \n";
c1.display();
cout<<"circle 2\n";
c2.display();
getch();
}