package ru.homeWork;

public class quadraticEquation {

    public static void main(String[] args) {
        qEqA(1, 2, 3);
    }

      public static void qEqA(double a, double b, double c) {
        if (a == 0) {
            if (b != 0) {
                //a=0 b!=0
                double xL = -c / b;
                System.out.println("Equation is not quadratic! Answer = " + xL);
            } else if (c != 0) {
                //a=0 b=0 c!=0
                System.out.println("no solutions");
            } else {
                //a=0 b=0 c=0
                System.out.println("solutions are all numbers");
            }
        } else {
            //решаем квадратное уравнение
            quadraticEquationR( a,  b,  c);
        }
    }


     public static void quadraticEquationR (double a, double b, double c) {
         double dis = b * b - 4 * a * c;
            if (dis < 0) {
                System.out.println("no solutions");
            } else if (dis > 0) {
                double x1 = xFind(a,b,dis,false);
                double x2 = xFind(a,b,dis,true);
                System.out.println("There are two answers x1 = " + x1 + " x2 = " + x2);
            } else {
                double x = (-b) / (2 * a);
                System.out.println("There is one answer x = " + x);
            }
     }

    public static double disF (double a, double b, double c) {
            return b * b - 4 * a * c;
    }

    public static double xFind (double a, double b, double dis, boolean f ) {
        if (!f) {
            return (-b - Math.sqrt(dis)) / (2 * a);
        } else {
            return (-b + Math.sqrt(dis)) / (2 * a);
        }
    }


  }