using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace Równanie_kwadratowe_2
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void label4_Click(object sender, EventArgs e)
        {

        }

        private void button2_Click(object sender, EventArgs e)
        {
            int a,b,c,p;
            double x,x1,x2;
            string znak_a, znak_b, znak_c;



            if (int.TryParse(textBox1.Text, out p)) a = p;
            else a = 0;
            if (int.TryParse(textBox2.Text, out p)) b = p;
            else b = 0;
            if (int.TryParse(textBox3.Text, out p)) c = p;
            else c = 0;

            if (a < 0) znak_a = "-"; else znak_a = "+";
            if (b < 0) znak_b = "-"; else znak_b = "+";
            if (c < 0) znak_c = "-"; else znak_c = "+";

            double delta = (b*b) - (4*a*c);

            if (a == 0 && b == 0) label5.Text = "To nie jest równanie kwadratowe.";
            else if (a == 0 && b != 0) { c = c * (-1); x = c / b; label5.Text = "Wynik równania = " + x.ToString(); }
            else if (delta > 0) { b = b * (-1); x1 = (b - Math.Sqrt(delta)) / (2 * a); x2 = (b + Math.Sqrt(delta)) / (2 * a); label5.Text = "Wynik równania = "+ x1.ToString() + " " + x2.ToString(); }
            else if (delta == 0) { b = b * (-1); x = b / (2 * a); label5.Text = "Wynik równania = " + x.ToString(); }
            else label5.Text = "Brak rozwiązań";


            label4.Text = znak_a + textBox1.Text + "x^2 " + znak_b + textBox2.Text + "x " + znak_c + textBox3.Text + " =0";
        }
    }
}