5ta zad

#include <iostream>
#include <math.h>
using namespace std;

int main()
{
    double a, b, c;
    cin >> a >> b >> c;

    double d = (b * b) - (4 * a * c);

    double y1 = (-b + sqrt(d)) / a;
    double y2 = (-b + sqrt(d)) / a;

    if (std::isnan(y1) && std::isnan(y2))
    {
        if (y1 > 0 && y2 > 0)
        {
            cout << "x1 = " << sqrt(y1);
            cout << "x2 = " << sqrt(y2);
        }
        else if (y1 > 0 && y2 < 0)
        {
            cout << "x1 = " << sqrt(y1);
        }
        else if (y2 > 0 && y1 < 0)
        {
            cout << "x1 = " << sqrt(y2);
        }
        else
        {
            cout << "Error";
        }
    }
    else
    {
        cout << "Wrong numbers!";
    }
    return 0;
}