Java 代码

import java.util.Scanner;

public class Main
{
    public static void main(String[] args)
    {
        Scanner cin = new Scanner(System.in);

        double a = cin.nextDouble();
        double b = cin.nextDouble();
        double c = cin.nextDouble();

        if (a == 0)
            System.out.println("Impossivel calcular");
        else 
        {
            double d = b * b - 4 * a * c;
            if (d < 0)
                System.out.println("Impossivel calcular");
            else
            {
                a *= 2;
                System.out.println("R1 = " + String.format("%.5f", (- b + Math.sqrt(d))/a));
                System.out.println("R2 = " + String.format("%.5f", (- b - Math.sqrt(d))/a));
            }
        }
    }
}