---

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


namespace WindowsFormsApp2
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void label1_Click(object sender, EventArgs e)
        {
         
        }

        private void button1_Click(object sender, EventArgs e)
        {
            if (Checker(textBox1) && Checker(textBox2) && Checker(textBox1))
            {
                Calculate();
            }
            
        }

        public void Calculate()
        {
            int count = int.Parse(textBox1.Text);
            

            int a = int.Parse(textBox1.Text);
            int b = int.Parse(textBox2.Text);
            int c = int.Parse(textBox3.Text);
            double d = Math.Pow(b, 2) - (4 * a * c);
            double x1;
            double x2;
            if (d > 0) 
            { 
            x1 = (-b - Math.Sqrt(d) / (2 * a));
            x2 = (-b + Math.Sqrt(d) / (2 * a));

            }

            if (d == 0)
            {
                x1 = (-b) / (2 * a);
                label2.Text = "x1 = " + x1.ToString();
            }
            if (d<0) 
            {
                label2.Text = "нет корней";
                label3.Text = "нет корней";

            }
            label1.Text = "D = " + d.ToString();
           
        }
        public bool Checker(TextBox textBox)
        {
            if (int.TryParse(textBox.Text, out int result))
            {
            return true;

            }
            else
            {
                label2.Text = " НЕ ЗАПОЛНЕНО";
            return false;
            }

        }
        private void Form1_Load(object sender, EventArgs e)
        {

        }

        private void textBox1_TextChanged(object sender, EventArgs e)
        {

        }

        private void textBox2_TextChanged(object sender, EventArgs e)
        {

        }

        private void label3_Click(object sender, EventArgs e)
        {

        }
    }
}