1 #include <iostream>
 2 #include <iomanip>
 3 using namespace std;
 4 
 5 int main()
 6 {
 7     const double PI = 3.141592654;
 8     double rayon;
 9 
10     cout << "Calcul de la circonférence et de la surface d'un cercle" << endl;
11     cout << "Valeur du rayon = ";
12     cin >> rayon;
13     cout << setprecision(3);
14     cout << "Circonférence = " << 2*PI*rayon << " m" << endl;
15     cout << "Surface = " << PI*rayon*rayon << " m²" << endl;
16     return 0;
17 }
18 
19