//Checks for operators in the string and, if so, calculates the sum and displays it in the
//second display label.
private void ButtonPress()
{
if (Calculate.CheckContainsOperators(workingString))
{
result = Calculate.calculate(workingString);
lblDisplay3.Text = result.ToString();
}
resulted = false;
newNumber = false;
Display();
}
//If the equals button has been pressed the result is cleared and handles reset.
//If not, the last digit or operator is deleted from the input. Checks are done to ensure
//that multiple operators, decimal points etc can't be entered afterwards.
//If the input is completely deleted then everything is cleared.
private void Delete()
{
if (resulted == true)
{
lblDisplay1.Text = "";
lblDisplay3.Text = "";
workingString = "";
result = 0;
decimalPointed = false;
newNumber = true;
}
else
{
if (workingString.Length > 0)
{
workingString = workingString.Remove(workingString.Length - 1);
if (workingString.Length > 0 && Calculate.CheckContainsOperators(workingString) &&
!Calculate.CheckForDoubleOperator(workingString))
{
result = Calculate.calculate(workingString);
lblDisplay3.Text = result.ToString();
}
if (workingString.Contains("."))
{
if (Calculate.CheckContainsOperators(workingString))
{
string[] splitString;
splitString = workingString.Split('+', '-', '*', '/');
if (splitString[splitString.Length - 1].Contains("."))
{
decimalPointed = true;
}
else
{
decimalPointed = false;
}
}
else
{
decimalPointed = true;
}
}
else
{
decimalPointed = false;
}
if (Calculate.CheckContainsOperators(workingString))
{
string[] splitString;
splitString = workingString.Split('+', '-', '*', '/');
if (splitString[splitString.Length - 1].Length == 0)
{
newNumber = true;
}
}
lblDisplay1.Text = "";
Display();
}
else
{
lblDisplay1.Text = "";
lblDisplay3.Text = "";
workingString = "";
result = 0;
decimalPointed = false;
newNumber = true;
}
}
}