#include <iostream>
#include <cmath>

using namespace std;

int main()
{
   //let us solve the eq.: ax^2+bx+c=0

    double a,b,c,d;

    cout << "please enter the value of a: "<<endl;
    cin >> a;
      cout << "please enter the value of b: "<<endl;
    cin >> b;
      cout << "please enter the value of c: "<<endl;
    cin >> c;
  
  if (a==0)
    {
          if (b==0)
         {
             if (c==0)
             {
                cout << " - identity!"<<endl;
             }
            else 
             {
                cout << " - not possible - not a solution!"<<endl;
              }
         }

        else 
        {
            cout << "- the solution is:" << -c/b<<endl;
         }
    }

    else 
    {
        d = b*b-4*a*c;

          if (d<0)
           {
            cout << "- no real valued solution :" <<endl;
           }

          if (d==0)
           {
            cout << "- the solution is:" << -b/(2*a)<<endl;
           }

        if (d>0)
           {
              cout <<  "- the solutions are: "<<endl;
              cout << (-b+sqrt(d))/(2*a) << endl;
              cout << (-b-sqrt(d))/(2*a) << endl;

           }

      }

    return 0;
}