/*
 * To change this license header, choose License Headers in Project Properties.
 * To change this template file, choose Tools | Templates
 * and open the template in the editor.
 */
package javaapplication1;

import java.util.List;
import java.util.Scanner;
/**
 *
 * @author pw.d.9
 */
public class JavaApplication1 {

    /**
     * @param args the command line arguments
     */
    public static void main(String[] args) {
        System.out.println("hello world");
        double a,b,c;
        Scanner sc = new Scanner(System.in);
        RównanieKwadratowe rk;// = new RównanieKwadratowe(2, 2, -12);
//        double d = rk.obliczDelte();
//        double[] zerowe = rk.mscZerowe(d);
//        System.out.println(zerowe[0]);
//        System.out.println(zerowe[1]);
       // System.out.print("Podaj a: ");
        a= 5;//sc.nextDouble();
        //System.out.print("Podaj b: ");
        b= 4;//sc.nextDouble();
        //System.out.print("Podaj c: ");
        c= -12;//sc.nextDouble();
        rk = new RównanieKwadratowe(a, b, c);
        double d = rk.obliczDelte();
        double[] zerowe = rk.mscZerowe(d);
        System.out.println(zerowe[0]);
        System.out.println(zerowe[1]);
        System.out.print("Podaj x0: ");
        double x0 = sc.nextDouble();
        System.out.print("Podaj x1: ");
        double x1 = sc.nextDouble();
        System.out.print("Podaj skok: ");
        double skok = sc.nextDouble();
        List<Double> rs = rk.obliczWPrzedziale(x0, x1, skok);
        System.out.println("X     Y");
        for(double y : rs){
//            System.out.println(x0 + "   " + y);
            System.out.println(String.format("%1$-2.3f   %2$2.3f", x0, y));
            x0+=skok;
        }
        
        
    }
    
}









//RównanieKwadratowe.java
/*
 * To change this license header, choose License Headers in Project Properties.
 * To change this template file, choose Tools | Templates
 * and open the template in the editor.
 */
package javaapplication1;

import java.util.ArrayList;
import java.util.List;

/**
 *
 * @author pw.d.9
 */
class RównanieKwadratowe {
    private double _a, _b, _c;
    public RównanieKwadratowe(double a, double b, double c) {
        _a = a;
        _b = b;
        _c = c;
    }
    public double obliczDelte(){
        return _b*_b - 4*_a*_c;
    }
    public double[] mscZerowe(double delta) {
        double[] msc_zerowe = {0,0};
        if(delta > 0){
            msc_zerowe[0] = (-_b - Math.sqrt(delta))/2*_a;
            msc_zerowe[1] = (-_b + Math.sqrt(delta))/2*_a;
            return msc_zerowe;
        }
        if(delta == 0){
            msc_zerowe[0] = -_b/2*_a;
            msc_zerowe[1] = -_b/2*_a;
            return msc_zerowe;
        }
        return msc_zerowe;
    }
    public double function(double x){
        return _a*x*x+_b*x+_c;
    }
    public List<Double> obliczWPrzedziale(double x0, double x1, double skok){
        List<Double> results = new ArrayList<>();
        
        for(double x = x0; x<x1; x+=skok){
            results.add(function(x));
        }
        return results;
    }
}