private bool Check_LastSymb(object sender)
{
char ch = char.Parse((sender as Button).Tag.ToString());
if (RPN.IsOperand(ch) || RPN.IsSpecSymb(ch) || Char.IsDigit(ch))
{
if (textbox.Text != "")
{
char[] txt = textbox.Text.ToCharArray();
if (!RPN.IsOperand(txt[txt.Length - 1]))
{
return(true);
}
if (RPN.IsSpecSymb(ch) || Char.IsDigit(ch))
{
return(true);
}
}
else
{
if (Char.IsDigit(ch))
{
return(true);
}
}
}
return(false);
}
private void Check_LastSymb(object sender, KeyPressEventArgs e)
{
char number = e.KeyChar;
e.Handled = true;
if (RPN.IsOperand(number) || RPN.IsSpecSymb(number) || Char.IsDigit(number) || number == 8)
{
if (textbox.Text != "")
{
char[] txt = textbox.Text.ToCharArray();
if (!RPN.IsOperand(txt[txt.Length - 1]))
{
e.Handled = false;
}
if (RPN.IsSpecSymb(number) || Char.IsDigit(number))
{
e.Handled = false;
}
if (number == 8)
{
e.Handled = false;
}
}
else
{
if (Char.IsDigit(number))
{
e.Handled = false;
}
}
}
}
private void pm_switch(object sender, EventArgs e)
{
if (!CheckLock())
{
if (textbox.Text != "")
{
bool check = true;
string newText = "";
char[] src = textbox.Text.ToCharArray();
int pos = src.Length - 1;
int i = -1;
for (; pos >= 0; pos--)
{
if (check)
{
if (!Char.IsDigit(src[pos]))
{
check = false;
i = pos; break;
}
if (pos == 0)
{
check = false;
i = -1;
}
}
}
for (int j = 0; j < src.Length; j++)
{
if (j == 0 && i == -1)
{
newText += "-" + src[0];
}
else
{
if (j == i)
{
switch (src[j])
{
case '+': { newText += "-"; } break;
case '-': { if (j != 0 && !RPN.IsOperand(src[j - 1]))
{
newText += "+";
}
} break;
default: { newText += src[j] + "-"; } break;
}
}
else
{
newText += src[j];
}
}
}
textbox.Text = newText;
}
else
{
textbox.Text = "-";
}
}
}