private void AddForPreview()
{
if (numberOperation.Values.LastOrDefault() == elementsDictionary[btnSqrt.Content.ToString()])
{
double calculateSqrt = CalculateSqrt(entryNumbers.LastOrDefault());
lblCalculation.Content += "(" + numberOperation.Values.LastOrDefault() + "(" + entryNumbers.LastOrDefault() + ")=" + calculateSqrt + ")";
lblCurrentNumber.Content = calculateSqrt;
}
else if (numberOperation.Values.LastOrDefault() == btnPercent.Content.ToString())
{
double calculatePercent = (entryNumbers.ElementAtOrDefault(entryNumbers.Count - 2) * (entryNumbers.LastOrDefault() / 100.0d));
lblCalculation.Content += "(" + entryNumbers.ElementAtOrDefault(entryNumbers.Count - 2) + "*" + entryNumbers.LastOrDefault() + numberOperation.Values.LastOrDefault() + "=" + calculatePercent + ")";
lblCurrentNumber.Content = calculatePercent;
}
else
{
if (numberOperation.Values.ElementAtOrDefault(numberOperation.Count - 2) != elementsDictionary[btnSqrt.Content.ToString()] &&
numberOperation.Values.ElementAtOrDefault(numberOperation.Count - 2) != btnPercent.Content.ToString())
{
lblCalculation.Content += entryNumbers.LastOrDefault() + numberOperation.Values.LastOrDefault();
lblCurrentNumber.Content = string.Empty;
}
else
{
lblCalculation.Content += numberOperation.Values.LastOrDefault();
}
}
}
