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

        int sa;

        private void button1_Click(object sender, EventArgs e)

        {       // 1-2-3-4-6-9-13... işlemini yapın         
            double a=0, b=0, c=0, toplam=0, sayac=0;
            try
            {
               
               a = Convert.ToDouble(textBox1.Text);
               b = Convert.ToDouble(textBox2.Text);
               toplam = a + b;
               listBox1.Items.Add(a);
               listBox1.Items.Add(b);
               c  =  toplam  ;
               listBox1.Items.Add(toplam);

            start:
                toplam = a + c;
                a = b;
                b = c;
                c = toplam;
                sayac++;
                listBox1.Items.Add(c);

                if (sayac < 6)
                {
                goto start;
                }
            }
            catch (Exception)
            {

                MessageBox.Show("ne yap*maya calısıyorsunuz .");
            }



        }

        private void button2_Click(object sender, EventArgs e)
        {
            //int i=0;

            //for (;;)
            //{
            //    if (i<10)
            //    {
            //        listBox1.Items.Add(i);
            //    }
            //}

            for (int i = 0; i < 10; i++)
            {
                listBox1.Items.Add(i);
            }

            int sayac=4;
            while (sayac<10)
            {
                listBox1.Items.Add(sayac);
            }

            int count = 0;
            do
            {
                count++;
                listBox1.Items.Add(count);


            } while (count<10);
        }

        private void Form1_Load(object sender, EventArgs e)
        {

            //diziler
            string[] myarray = new string[6];
            myarray[0] = "hasabn";
            myarray[1] = "hasabn";
            myarray[2] = "hasabne";

            Array.Resize(ref myarray, myarray.Length + 1); // otomatik artır 

            //for (int i = 0; i < myarray.Length; i++)
            //{

            //    MessageBox.Show(myarray[i]);
            //}

            List<string> hasan = new List<string>(); // list örneği 


                hasan.Add("hasan");
            hasan.Add("asda");
            hasan.Add("asdasda");
            hasan.Add("asdasd");

            //for (int i = 0; i < hasan.Count; i++)
            //{
            //    MessageBox.Show(hasan[i]);

            //}

            foreach (var item in hasan)
            {


            }
                   



            

      }
        // 
    }



}