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

namespace Calc
{
public partial class MainForm : Form
{
double sonuc = 0;
bool sifirla = true;
string islem = “yok”;
int kontrol=0;
public MainForm()
{

InitializeComponent();

}
private void dortislem()
{
if (!sifirla)
{
switch (islem)
{
case “esittir”:
sonuc = Convert.ToDouble(txtAlan.Text);
break;
case “carpma”:
sonuc *= Convert.ToDouble(txtAlan.Text);
break;
case “toplama”:
sonuc += Convert.ToDouble(txtAlan.Text);
break;
case “cikarma”:
sonuc -= Convert.ToDouble(txtAlan.Text);
islem = “yok”;
break;
case “bolme”:
sonuc /= Convert.ToDouble(txtAlan.Text);
break;
case “yok”:
sonuc = Convert.ToDouble(txtAlan.Text);
break;
}

txtAlan.Text = Convert.ToString(sonuc);
sifirla = true;
}

}
private void tekislem()
{
if (!sifirla)
{
switch (islem)
{

}
}
}

private void Form1_Load(object sender, EventArgs e)
{

}

private void btn_sifir_Click(object sender, EventArgs e)
{
if (!sifirla)
{
if (txtAlan.Text != “0″)
{
txtAlan.Text += “0″;
sifirla = false;
}
else
{
txtAlan.Text = “0″;
sifirla = true;
}
}
else { txtAlan.Text = “0″; }
}

private void btn_bir_Click(object sender, EventArgs e)
{
if (!sifirla)
{
txtAlan.Text += “1″;
}
else
{
txtAlan.Text = “1″;
}
sifirla = false;
}

private void btn_iki_Click(object sender, EventArgs e)
{
if (!sifirla)
{
txtAlan.Text += “2″;
}
else
{
txtAlan.Text = “2″;
}
sifirla = false;
}

private void btn_uc_Click(object sender, EventArgs e)
{

if (!sifirla)
{
txtAlan.Text += “3″;
}
else
{
txtAlan.Text = “3″;
}
sifirla = false;
}

private void btn_dort_Click(object sender, EventArgs e)
{

if (!sifirla)
{
txtAlan.Text += “4″;
}
else
{
txtAlan.Text = “4″;
}
sifirla = false;
}

private void button5_Click(object sender, EventArgs e)
{
if (!sifirla)
{
txtAlan.Text += “5″;
}
else
{
txtAlan.Text = “5″;
}
sifirla = false;
}

private void btn_alti_Click(object sender, EventArgs e)
{

if (!sifirla)
{
txtAlan.Text += “6″;
}
else
{
txtAlan.Text = “6″;
}
sifirla = false;
}

private void btn_yedi_Click(object sender, EventArgs e)
{
if (!sifirla)
{
txtAlan.Text += “7″;
}
else
{
txtAlan.Text = “7″;
}
sifirla = false;
}

private void btn_sekiz_Click(object sender, EventArgs e)
{
if (!sifirla)
{
txtAlan.Text += “8″;
}
else
{
txtAlan.Text = “8″;
}
sifirla = false;
}

private void button9_Click(object sender, EventArgs e)
{
if (!sifirla)
{
txtAlan.Text += “9″;
}
else
{
txtAlan.Text = “9″;
}
sifirla = false;
}

private void btn_top_Click(object sender, EventArgs e)
{
topl();
}
void topl()
{
dortislem();
islem = “toplama”;
}

private void btn_cikar_Click(object sender, EventArgs e)
{
cık();
}
void cık()
{
dortislem();
islem = “cikarma”;
}

private void btn_carp_Click(object sender, EventArgs e)
{

carp();
}
void carp()
{

dortislem();
islem = “carpma”;
}
private void btn_bol_Click(object sender, EventArgs e)
{
bol();
}
void bol()
{
dortislem();
islem = “bolme”;
}

private void btn_temiz_Click(object sender, EventArgs e)
{
txtAlan.Clear();
txtAlan.Text = “0″;
sonuc = 0;
islem = “yok”;
sifirla = true;
}

private void btn_esit_Click(object sender, EventArgs e)
{
esit();
}
void esit()
{
dortislem();
islem = “esittir”;
txtAlan.Focus();
}

private void btn_kk_Click(object sender, EventArgs e)
{
double a;
dortislem();
a = Math.Sqrt(sonuc);
txtAlan.Text = Convert.ToString(a);
}

private void btn_bolu_Click(object sender, EventArgs e)
{
dortislem();
sonuc = 1 / sonuc;
txtAlan.Text = Convert.ToString(sonuc);
islem = “1bolux”;
}

private void btn_trs_Click(object sender, EventArgs e)
{

dortislem();
sonuc = -1 * sonuc;
txtAlan.Text = Convert.ToString(sonuc);
islem = “artieksi”;
}

private void btn_vrgl_Click(object sender, EventArgs e)
{
if (!sifirla)
{
txtAlan.Text += “,”;
}
else
{
txtAlan.Text = “,”;
}
sifirla = false;
}

private void btn_yzd_Click(object sender, EventArgs e)
{
double c;
dortislem();
c = (sonuc) / 100;
txtAlan.Text = Convert.ToString(c);
}

private void txtAlan_KeyPress(object sender, KeyPressEventArgs e)
{
if (char.IsDigit(e.KeyChar) == false)
{
switch(e.KeyChar.ToString())
{
case “-”: sifirla = false; cık() ; e.Handled = true; break;
case “+”: sifirla = false; topl(); e.Handled = true; break;
case “*”: sifirla = false; carp(); e.Handled = true; break;
case “/”: sifirla = false; bol() ; e.Handled = true; break;
case “=”: sifirla = false; esit(); e.Handled = true; kontrol++; break;
case “\b”:
default:
e.Handled = true; break;
}
if (islem != “0″ && kontrol == 0)
{
txtAlan.Text = “”;
}
else
{
kontrol = 0;
}
if (sifirla)
{
sifirla = false;
}

}

}

}
}