public static void DoMath(TextBox input, TextBox output, char action, ref bool error, ref bool read, ref string last)
{
string _in = input.Text;
string _out = output.Text;
if (_in.EndsWith(","))
{
_in = _in.Replace(",", "");
input.Text = _in;
}
if (action != '=')
{
if (_out.Length == 0)
{
output.Text = _in + ' ' + action;
read = false;
}
else
{
if ((_out.EndsWith("+") || _out.EndsWith("/") || _out.EndsWith("-") || _out.EndsWith("*")) && read == false)
{
output.Text = _out.Remove(_out.Length - 1, 1) + action;
}
else if (_out.EndsWith("="))
{
output.Text = _in + ' ' + action;
}
else
{
output.Text = _out + ' ' + _in + ' ' + action;
input.Text = Logic.Calculate(_out + ' ' + _in, ref error);
read = false;
}
}
}
else
{
if (_out.Length == 0)
{
output.Text = _in + " =";
}
else
{
if (_out.Last() == '=')
{
output.Text = _in + last + " =";
input.Text = Logic.Calculate(_in + last, ref error);
}
else
{
last = ' ' + _out.Last().ToString() + ' ' + _in;
input.Text = Logic.Calculate(_out + ' ' + _in, ref error);
output.Text = _out + ' ' + _in + " =";
}
}
read = false;
}
output.Select(output.Text.Length, 0);
output.Focus();
}