/******************************************************************************

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*******************************************************************************/
#include <iostream>
#include <cmath>

using namespace std;
int main ()
{
  float a, b, c,x,x1,x2;
  cout << " a:";
  cin >> a;
  cout << " b:";
  cin >> b;
  cout << " c:";
  cin >> c;

if (a!=0) 
    {
    if (b*b>4*a*c)  
        {
        x1=(-1*b-sqrt(b*b>4*a*c))/(2*a);
        x2=(-1*b+sqrt(b*b>4*a*c))/(2*a);
        cout << "Koreny kvadraticke rovnice jsou: " <<endl;
        cout << "x1 = " << x1 << endl;
        cout << "x2 = " << x2 << endl;
        }
        else 
        {
        if (b*b==4*a*c) 
            {
            x=-1*b/(2*a);
            cout << "spolecnym korenem je: " <<endl;
            cout << "x = " << x << endl;
            }
            else
            {
             cout << "Koreny kvadraticke rovnice nema reseni v R. " <<endl;    
            }
            
        }
        
        
    }
    else
    {
    cout << "Nejedna se o kvadratickou rovnici";    
    }
return 0;
}