package de.dhbwka.java.exercise.control_structures;

public class Quadratics {
  public static void main(String[] args) {
    java.util.Scanner scan = new java.util.Scanner(System.in);

    System.out.print("a: ");
    double a = scan.nextDouble();
    System.out.print("b: ");
    double b = scan.nextDouble();
    System.out.print("c: ");
    double c = scan.nextDouble();

    scan.close();

    if (a == 0) {
      if (b == 0) {
        System.out.println("Die Gleichung ist degeneriert.");
      } else {
        double x = -c / b;
        System.out.println("x = " + x);
      }
    } else {
      double d = b * b - 4 * a * c;
      if (d >= 0) {
        double x1 = (-b + Math.sqrt(d)) / (2 * a);
        double x2 = (-b - Math.sqrt(d)) / (2 * a);
        System.out.println("x1 = " + x1 + ", x2 = " + x2);
      } else {
        double real = -b / (2 * a);
        double imag = Math.sqrt(-d) / (2 * a);
        System.out.println("x1 = " + real + " + " + imag + "i, x2 = " + real + " - " + imag + "i");
      }
    }
  }
}