#include 
#include 

using namespace std;

int main(int argc, char **argv)
{
  float a, b, c;
  float delta;

  cout << "Entrez les coefficients:" << endl << "a: ";
  cin >> a;
  cout << "b: ";
  cin >> b;
  cout << "c: ";
  cin >> c;

  delta = b*b-4*a*c;

  if (delta < 0)
    cout << "Je ne sais pas calculer les racines dans ce cas." << endl;
  else {
    cout << "Les deux racines sont: " << endl;
    cout << "1) " << (-b+sqrt(delta))/2/a << endl;
    cout << "2) " << (-b-sqrt(delta))/2/a << endl;
  }

  return 0;
}