//Úloha 9
public static void main(String[] args) {

        Scanner num = new Scanner(System.in);

        System.out.println("Program pre výpočet kvadratickej rovnice D=b²-4ac");

        //Scanner
        System.out.println("Zadaj a");
        double a = num.nextDouble();
        System.out.println("Zadaj b");
        double b = num.nextDouble();
        System.out.println("Zadaj c");
        double c = num.nextDouble();
        num.close();

        double D = Math.pow(b,2) - (4*a*c);
        System.out.println("D=" + D);

    }