public void CalculatorButtonClicked(object keyData)
{
CalculatorKeyData calculatorKeyData = (CalculatorKeyData)keyData;
var value = calculatorKeyData.KeyName;
if (operationStringArr.Any(x => ResultString.EndsWith(x) && ResultString.EndsWith(value)))
{
return;
}
if (value == "C")
{
ResultString = "0";
return;
}
if (ResultString == "0" || ResultString == "E")
{
ResultString = "";
}
//restricts the calculator input to max of 15 character length
if (ResultString.Length >= 15 && !operationStringArr.Any(x => ResultString.Contains(x)))
{
return;
}
else if (ResultString.Length >= 15 && value != "=")
{
return;
}
ResultString += Convert.ToString(value);
if (value == "=")
{
try{
ResultString = new DataTable().Compute(ResultString.TrimEnd('='), null).ToString();
}
catch (Exception ex) {
//returns error to user if any operation in the screen results in and error during parsing and computation
ResultString = "E";
}
}
}
