public void signChange()
{
bool anyOperators = false;
bool positiveSign = true;
int index = 0;
string x = "";
if (OperationDisplay.Length != 0 && !(OperationDisplay.LastIndexOfAny(operators.ToArray()) == OperationDisplay.Length - 1))
{
for (int i = 0; i < 4; i++)
{
if (OperationDisplay.Contains(operators[i]))
{
anyOperators = true;
}
}
if (anyOperators)
{
index = OperationDisplay.LastIndexOfAny(operators.ToArray());
}
if (anyOperators && OperationDisplay.Substring(index - 1).Contains('('))
{
positiveSign = false;
}
if (positiveSign)
{
if (index != 0)
{
x = OperationDisplay.Substring(index + 1);
}
else
{
x = OperationDisplay;
}
x = "(-" + x + ')';
if (index != 0)
{
OperationDisplay = OperationDisplay.Remove(index + 1);
OperationDisplay += x;
}
else
{
OperationDisplay = x;
}
}
else
{
x = OperationDisplay.Substring(index - 1);
x = x.Trim('(', ')');
x = x.Trim('-');
OperationDisplay = OperationDisplay.Remove(index - 1);
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 += '.';
}
}
}
public bool noDoubleOperators()
{
if (OperationDisplay.LastIndexOfAny(operators.ToArray()) == OperationDisplay.Length - 1)
{
OperationDisplay = OperationDisplay.Trim(operators.ToArray());
}
bool anyPreviousOperations = false;
for (int i = 0; i < 4; i++)
{
if (OperationDisplay.Contains(operators[i]))
{
anyPreviousOperations = true;
}
}
return(anyPreviousOperations);
}