#include <conio.h>
#include <iostream>
using namespace std;

class kugla
{
      private:// float r;
      
      public: float r;
              float Opseg()
              {
                   return r*r;
              }
              
              float Povrsina()
              {
                    return 4*r*r*3.14; 
                    
              }
              
              kugla (float x)  {r=x;}
              kugla () {r=1;}
              
      };
      
int main()
{
kugla A(2);
kugla B;
kugla C(4);

cout<<A.Opseg()<<endl;
cout<<A.Povrsina()<<endl<<endl;

cout<<B.Opseg()<<endl;
cout<<B.Povrsina()<<endl;

cout<<C.Opseg()<<endl;
cout<<C.Povrsina()<<endl;


getch();    
}