//<--
private void button_BackSpace_Click(object sender, EventArgs e)
{
if (textBox1.TextLength != 0)
{
if (state == StateCacl.HasLeftOperand)
{
if (textBox1.TextLength - 1 == 0)
{
textBox1.Clear();
state = StateCacl.NoN;
}
else
{
textBox1.Text = textBox1.Text.Remove(textBox1.TextLength - 1, 1);
}
}
else if (state == StateCacl.HasZnak)
{
textBox1.Text = textBox1.Text.Remove(textBox1.TextLength - 1, 1);
state = StateCacl.HasLeftOperand;
}
else if (state == StateCacl.HasRightOperand)
{
if (textBox1.TextLength - 1 == GetOperatorIndex() + 1)
{
state = StateCacl.HasZnak;
}
textBox1.Text = textBox1.Text.Remove(textBox1.TextLength - 1, 1);
}
}
}
//=
private void button_Result_Click(object sender, EventArgs e)
{
if (state == StateCacl.HasRightOperand)
{
int operInd = GetOperatorIndex();
b = float.Parse(textBox1.Text.Substring(operInd + 1, textBox1.TextLength - operInd - 1));
Calculate();
textBox1.Text = string.Format("{0:f2}", c.ToString());
a = c;
state = StateCacl.HasLeftOperand;
}
}
private void button_Dev_Click(object sender, EventArgs e)
{
if (state == StateCacl.HasLeftOperand)
{
a = float.Parse(textBox1.Text);
textBox1.Text += "/";
oper = Oper.Divide;
state = StateCacl.HasZnak;
}
else if (state == StateCacl.HasZnak)
{
textBox1.Text = textBox1.Text.Remove(textBox1.TextLength - 1, 1);
textBox1.Text += "/";
oper = Oper.Divide;
}
}
private void button_Three_Click(object sender, EventArgs e)
{
if (state == StateCacl.HasRightOperand || state == StateCacl.HasZnak)
{
textBox1.Text += 3;
state = StateCacl.HasRightOperand;
}
else if (state == StateCacl.NoN)
{
textBox1.Text = "3";
state = StateCacl.HasLeftOperand;
}
else if (state == StateCacl.HasLeftOperand)
{
textBox1.Text += 3;
}
}
//.
private void button_dot_Click(object sender, EventArgs e)
{
if (state == StateCacl.NoN)
{
textBox1.Text = "0,";
state = StateCacl.HasLeftOperand;
}
else if (state == StateCacl.HasZnak)
{
textBox1.Text += "0,";
state = StateCacl.HasRightOperand;
}
else
{
char[] Ch = { ',', '.' };
if (textBox1.Text.IndexOfAny(Ch) == -1)
{
textBox1.Text += ",";
}
}
}
private void Form1_Load(object sender, EventArgs e)
{
c = 0;
textBox1.Text = c.ToString();
state = StateCacl.NoN;
}
//C
private void button_C_Click(object sender, EventArgs e)
{
state = StateCacl.NoN;
c = 0;
textBox1.Text = c.ToString();
}