#include <iostream>

using namespace std;

void Obsah(int &a, int &b,int &c);

int main()
{
    int a, c, b;
    cout << "Zadej stranu a: " << endl;
    cin >> a;
    cout << "Zadana hodnota: " << a << endl;
    Obsah(a, b, c);
    cout << "Obsah je: " << c << "\t Obvod je: " <<  b;
    cout << "\t Zadana hodnota: " << a << endl;
    return 0;
}

void Obsah(int &a, int &b,int &c)
{
    c = a*a;
    b = a+a+a+a;
}