Untitled

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

int main()
{
    float x1, x2 = 0;
    float D = 0;
    float a, b, c = 0;
    cin >> a >> b >> c;
    D = (b * b) - (4 * a) * c;
    if (D > 0) {
        x1 = (sqrt(D) + (-b)) / (2 * a);
        x2 = ((-b) - sqrt(D) ) / (2 * a);
        cout << x1;
        cout << x2;
    }
    else if (D == 0) {
        x1 = ((-b)) / (2 * a);
        cout << x1;
    }
    else cout << "NO";

}