/// <summary>
/// To find the percentage, if other additional operations are applied
/// </summary>
/// <remarks>
/// <para>For operations that do not have a character notation in the expression</para>
/// <para>In the case of the " % " operation, the change is that the last number or sequence of operations is replaced with a specific percentage of the rest of the expression</para>
/// </remarks>
/// <returns>
/// The string of the current expression with the percentage found
/// </returns>
private string ChangeTheSetOfRecentAdditionalOperations(string currentExpression)
{
int pos;
string copiedFragment;
StringBuilder stringBuilderCurExpr = CurrentExpressionChange(currentExpression, out pos, out copiedFragment);
Calculate calculate = new Calculate();
double number;
if (Common.MathSignCheck(currentExpression))
{
number = calculate.CalcPercentage(copiedFragment, stringBuilderCurExpr.ToString().Remove(stringBuilderCurExpr.Length - 3, 3));
}
else
{
number = calculate.CalcPercentage(copiedFragment, stringBuilderCurExpr.ToString());
}
if (NumberStandardization.NumberCheck(number.ToString()))
{
stringBuilderCurExpr.Insert(pos, number.ToString());
}
else
{
stringBuilderCurExpr.Insert(pos, ((int)Digits.Zero).ToString());
}
return(stringBuilderCurExpr.ToString());
}
/// <summary>
/// Clears the last digit entered in the current number
/// </summary>
public void Backspace()
{
if (buttonsState.EqualBtnPressed)
{
if (NumberStandardization.NumberCheck(currentData.CurrentNumber))
{
currentData.CurrentExpression = ClearExpression(currentData.CurrentExpression);
buttonsState.NumberPadBtnPressed_Change(true);
buttonsState.AdditionalOperationBtnPressed_Change(false);
buttonsState.EqualBtnPressed_Change(false);
}
else
{
ClearAll();
}
}
else
{
currentData.CurrentNumber = Backspace(currentData.CurrentNumber);
}
}