public void undo()
{
if (OperationDisplay != "")
{
OperationDisplay = OperationDisplay.Remove(OperationDisplay.Length - 1);
}
int openingBrackets = 0;
int closingBrackets = 0;
for (int i = 0; i < OperationDisplay.Length; i++)
{
if (OperationDisplay[i] == '(')
{
openingBrackets++;
}
if (OperationDisplay[i] == ')')
{
closingBrackets++;
}
}
if (openingBrackets > closingBrackets)
{
string x = OperationDisplay.Substring(OperationDisplay.LastIndexOf('('));
x = x.Trim('(');
x = x.Trim('-');
OperationDisplay = OperationDisplay.Remove(OperationDisplay.LastIndexOf('('));
OperationDisplay += x;
}
}
public bool isNegative()
{
int index_oprtr = OperationDisplay.LastIndexOfAny(operators.ToArray());
int index_bracket = OperationDisplay.LastIndexOf('(');
if (index_oprtr == index_bracket + 1)
{
return(true);
}
return(false);
}
public void noWrongDots()
{
if (((OperationDisplay.LastIndexOf('.') < OperationDisplay.LastIndexOfAny(operators.ToArray())) || (!OperationDisplay.Contains('.'))) && OperationDisplay != "")
{
if (OperationDisplay.LastIndexOf(')') == OperationDisplay.Length - 1)
{
OperationDisplay = OperationDisplay.Insert(OperationDisplay.Length - 1, ".");
}
else if (OperationDisplay.LastIndexOfAny(operators.ToArray()) != OperationDisplay.Length - 1)
{
OperationDisplay += '.';
}
}
}