private void button1_Click(object sender, EventArgs e)
{
var chisla = new Stack <double>();
string str;
str = textBox1.Text;
var list = str.Split(' ');
for (int i = 0; i < list.Length; i++)
{
if ((list[i] == "+") || (list[i] == "-") || (list[i] == "*") || (list[i] == "/"))
{
var num2 = chisla.Get_and_Remove();
var num1 = chisla.Get_and_Remove();
switch (list[i])
{
case "+":
chisla.Add(num1 + num2);
break;
case "-":
chisla.Add(num1 - num2);
break;
case "*":
chisla.Add(num1 * num2);
break;
case "/":
chisla.Add(1.0 * (num1 / num2));
break;
}
}
else
{
chisla.Add(double.Parse(list[i]));
}
}
textBox1.Text = Convert.ToString(chisla.Get());
}