Strukturni kod

 
#include <iostream>
#include <cmath>
using namespace std;

int 
main(void)
{
	double dStranicaA;
	cout<<"Unesite stranicu kvadrata->";
	cin>>dStranicaA;

	cout<<"Stranice kvadrata je: \n";
	cout<<"a ="<<dStranicaA<<endl;
	cout<<"Povrsina ="<<pow(dStranicaA,2)<<endl;
	cout<<"Obim ="<<4*dStranicaA<<endl;
	cout<<"Dijagonala ="<<sqrt(2*pow(dStranicaA,2))<<endl;

	system("PAUSE");
	return EXIT_SUCCESS;
}

  
#include <iostream>
#include <cmath>
using namespace std;

class CKvadrat
{
private:
	     double dA;
public:
	CKvadrat( double a=1){dA=a;}
	~CKvadrat(){};

	double StranicaA(void) { return dA;}

	double Povrsina(void)  { return pow(dA,2);}

	double Obim(void)      { return 4*dA;}

	double Dijagonala(void){ return (sqrt(2*pow(dA,2)));}
};

int
main(void)
{
	double dStranicaA;
	cout<<"Unesite stranicu kvadrata->";
	cin>>dStranicaA;

	CKvadrat Kvadrat(dStranicaA);
	cout<<"Stranica kvadrat je:"<<endl;
	cout<<"a = "<<Kvadrat.StranicaA()<<endl;
	cout<<"Povrsina ="<<Kvadrat.Povrsina()<<endl;
	cout<<"Obim ="<<Kvadrat.Obim()<<endl;
	cout<<"Dijagonala ="<<Kvadrat.Dijagonala()<<endl;

	system("PAUSE");
	return EXIT_SUCCESS;
}