Zadanie pętle 7

#include <iostream>
using namespace std;
int main()
{
    int x;
    float P=0,OBW=0;
    do
    {
        cout << "Podaj dlugosc promienia kola" << endl;
        cin >> x;
    } while (x <= 0);

    P = 3.14 * x;
    OBW = 3.14 * (2*x);

    cout << "Obwod kola wynosi: " << OBW << endl;
    cout << "Pole kola wynosi: " << P << endl;


}