Калькулятор на с#....

[Kamil H.]

Никак не могу найти ошибку....Поможете пожалуйста?:-)



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

namespace WindowsApplication2
{
public partial class Form1 : Form
{
double x, y;
char s;
double z;
public Form1()
{
x = 0;
s = '+';
InitializeComponent();

}


private void button1_Click(object sender, EventArgs e)
{y = double.Parse(s.Text);

switch (s)
{
case '+':
z = x + y;
break;
case '-':
z = x - y;
break;
case '*':
z = x *y;
break;
case '/':
z = x / y;
break;
case '=':
z = y;
break;
}

textBox1.Text = z.ToString();
x = z;
s = '+';
}

private void button2_Click(object sender, EventArgs e)
{
y = double.Parse(s.Text);

switch (s)
{
case '+':
z = x + y;
break;
case '-':
z = x - y;
break;
case '*':
z = x * y;
break;
case '/':
z = x / y;
break;
case '=':
z = y;
break;
}

textBox1.Text = z.ToString();
x = z;
s = '-';


}

private void button3_Click(object sender, EventArgs e)
{
y = double.Parse(s.Text);

switch (s)
{
case '+':
z = x + y;
break;
case '-':
z = x - y;
break;
case '*':
z = x * y;
break;
case '/':
z = x / y;
break;
case '=':
z = y;
break;
}

textBox1.Text = z.ToString();
x = z;
s = '*';

}

private void button4_Click(object sender, EventArgs e)
{
y = double.Parse(s.Text);

switch (s)
{
case '+':
z = x + y;
break;
case '-':
z = x - y;
break;
case '*':
z = x * y;
break;
case '/':
z = x / y;
break;
case '=':
z = y;
break;
}

textBox1.Text = z.ToString();
x = z;
s = '/';

}

private void button5_Click(object sender, EventArgs e)
{
y = double.Parse(s.Text);

switch (s)
{
case '+':
z = x + y;
break;
case '-':
z = x - y;
break;
case '*':
z = x * y;
break;
case '/':
z = x / y;
break;
case '=':
z = y;
break;
}

textBox1.Text = z.ToString();
x = z;
s = '=';

}

private void textBox1_TextChanged(object sender, EventArgs e)
{

}

} }