Strukturni kod

#include <iostream>
#include <cmath>
#define PI 3.141592
using namespace std;

int 
main(void)
{
	double dPoluprecnik;
	cout<<"Unesite poluprecnik->";
	cin>>dPoluprecnik;

	cout<<"Precnik iznosi: \n";
	cout<<"R = "<<dPoluprecnik<<endl;
	cout<<"Povrsina ="<<pow(dPoluprecnik,2)*PI<<endl;
	cout<<"Obim ="<<2*dPoluprecnik*PI<<endl;

	system("PAUSE");
	return EXIT_SUCCESS;
}

#include <iostream>
#include <cmath>
#define PI 3.141592
using namespace std;

class CKrug
{
private:
	     double dR;
public:
	CKrug( double r=1){dR=r;}
	~CKrug(){};

	double PostaviPoluprecnik(void) { return dR; }

	double Povrsina(void)  { return pow(dR,2)*PI; }

	double Obim(void)      { return 2*dR*PI;}


};

int
main(void)
{
	double dPoluprecnik;
	cout<<"Unesite poluprecnik->";
	cin>>dPoluprecnik;

	CKrug Krug(dPoluprecnik);
	cout<<"Poluprecnik iznosi: \n";
	cout<<"R = "<<Krug.PostaviPoluprecnik()<<endl;
	cout<<"Povrsina ="<<Krug.Povrsina()<<endl;
	cout<<"Obim ="<<Krug.Obim()<<endl;

	system("PAUSE");
	return EXIT_SUCCESS;
}