#include <iostream>
#include <cmath>
using namespace std;
class rectangle
{
private:
    double a,b;
public:
    rectangle();
    rectangle(double);
    rectangle(double,double);
    void lice();
    void peri();
    void diagonal();
    double output1(double p);
    double output2(double q);
};
rectangle::rectangle()
{
    a=10;
    b=20;
}
rectangle::rectangle(double x)
{
    a=x;
    b=x;
}
rectangle::rectangle(double m,double n)
{
    a=m;
    b=n;
}
void rectangle::lice()
{
    double S;
    S=a*b;
    cout << "S na pravougulnika e -> " << S << endl;
}
void rectangle::peri()
{
    double perimetur;
    perimetur=2*a+2*b;
    cout << "P na pravougulnika e -> " << perimetur << endl;
}
void rectangle::diagonal()
{
    double length;
    length=sqrt(a*a+b*b);
    cout << "Diagonala na pravougulnika e -> " << length << endl;
}
double rectangle::output1(double p)
{
    return p;
}
double rectangle::output2(double q)
{
    return q;
}
int main ()
{
    double str1, str2;
    cout << "Vavedi stranite na pravougalnika -> " << endl;
    cin >> str1 >> str2;
    rectangle first(str1, str2);
    first.lice();
    first.peri();
    first.diagonal();
    cout << first.output1(str1) << endl;
    cout << first.output2(str2) << endl;
    rectangle second(h1,h2);
    rectangle third(z1,z2);
    return 0;
}