#include <stdio.h>
#include <math.h>

int risolvi(double a, double b, double c, double *x1, double *x2) {
    double d = b * b - 4 * a * c;
    if (d < 0) return 0;
    *x1 = (-b + sqrt(d)) / (2 * a);
    *x2 = (-b - sqrt(d)) / (2 * a);
    return d > 0 ? 2 : 1;
}

int main() {
    double a, b, c, r1, r2;
    printf("Inserisci a, b, c: ");
    if (scanf("%lf %lf %lf", &a, &b, &c) == 3) {
        int n = risolvi(a, b, c, &r1, &r2);
        printf(n == 2 ? "Due sol: %.2f e %.2f\n" : (n == 1 ? "Una sol: %.2f\n" : "No sol.\n"), r1, r2);
    }
    return 0;