Hesap Makinesı

Güzel bir hesap makinesi
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;

namespace hesapmakinesi
{
public partial class Form1 : Form
{
double tamsayi, sonuc = 0;
float ondalik = 0;
bool sifirla = true;
string islem = "yok";
public Form1()
{
InitializeComponent();

}

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

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

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

}
}
}
private void button8_Click(object sender, EventArgs e)
{
if (!sifirla)
{
txtAlan.Text += "8";
}
else
{
txtAlan.Text = "8";
}
sifirla = false;
}

private void label1_Click(object sender, EventArgs e)
{

}

private void Form1_Load(object sender, EventArgs e)
{

}

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

private void button10_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 button1_Click(object sender, EventArgs e)
{
if (!sifirla)
{
txtAlan.Text += "1";
}
else
{
txtAlan.Text = "1";
}
sifirla = false;

}

private void button2_Click(object sender, EventArgs e)
{

if (!sifirla)
{
txtAlan.Text += "2";
}
else
{
txtAlan.Text = "2";
}
sifirla = false;
}

private void button3_Click(object sender, EventArgs e)
{
if (!sifirla)
{
txtAlan.Text += "3";
}
else
{
txtAlan.Text = "3";
}
sifirla = false;
}

private void button4_Click(object sender, EventArgs e)
{
if (!sifirla)
{
txtAlan.Text += "4";
}
else
{
txtAlan.Text = "4";
}
sifirla = false;
}

private void button6_Click(object sender, EventArgs e)
{
if (!sifirla)
{
txtAlan.Text += "6";
}
else
{
txtAlan.Text = "6";
}
sifirla = false;
}

private void button7_Click(object sender, EventArgs e)
{
if (!sifirla)
{
txtAlan.Text += "7";
}
else
{
txtAlan.Text = "7";
}
sifirla = false;
}

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

private void button13_Click(object sender, EventArgs e)
{
dortislem();
islem = "toplama";

}

private void button14_Click(object sender, EventArgs e)
{
dortislem();
islem = "cikarma";
}

private void button15_Click(object sender, EventArgs e)
{
dortislem();
islem = "carpma";
}

private void button16_Click(object sender, EventArgs e)
{
dortislem();
islem = "bolme";
}

private void button21_Click(object sender, EventArgs e)
{
txtAlan.Clear();
txtAlan.Text = "0";
sonuc = 0;
islem="yok";
sifirla= true;
}

private void button22_Click(object sender, EventArgs e)
{
Close();
}

private void button17_Click(object sender, EventArgs e)
{
dortislem();
islem = "esittir";
}

private void button20_Click(object sender, EventArgs e)
{
double a;
dortislem();
sonuc = Convert.ToInt32(txtAlan.Text);
a = Math.Sqrt(sonuc);
txtAlan.Text = Convert.ToString(a);

}

private void button18_Click(object sender, EventArgs e)
{
dortislem();
sonuc = 1 / sonuc;
txtAlan.Text = Convert.ToString(sonuc);
islem = "1bolux";
}

private void textBox1_TextChanged(object sender, EventArgs e)
{

}

private void button19_Click(object sender, EventArgs e)
{

}

private void button12_Click(object sender, EventArgs e)
{
dortislem();
sonuc = 0 - sonuc;
txtAlan.Text = Convert.ToString(sonuc);
islem = "artieksi";
}

private void button11_Click(object sender, EventArgs e)
{
if (!sifirla)
{
txtAlan.Text += ",";
}
else
{
txtAlan.Text = ",";
}
sifirla = false;
}
}
}