/// <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>
/// To change the current expression depending on the pressed operation and the state of the buttons
/// </summary>
private string NewCurrentExpression()
{
if (buttonsState.EqualBtnPressed)
{
buttonsState.NumberPadBtnPressed_Change(true);
buttonsState.AdditionalOperationBtnPressed_Change(false);
buttonsState.EqualBtnPressed_Change(false);
return(NumberStandardization.Standardization(calculate.CalcPercentage(NumberStandardization.Standardization(currentData.CurrentNumber), currentData.CurrentExpression.Remove(currentData.CurrentExpression.Length - 3, 3)).ToString()));
}
else
{
if (currentData.CurrentExpression != string.Empty)
{
if (buttonsState.AdditionalOperationBtnPressed)
{
return(ChangeTheSetOfRecentAdditionalOperations(currentData.CurrentExpression));
}
else
{
return(currentData.CurrentExpression + NumberStandardization.Standardization(calculate.CalcPercentage(NumberStandardization.Standardization(currentData.CurrentNumber), currentData.CurrentExpression.Remove(currentData.CurrentExpression.Length - 3, 3)).ToString()));
}
}
else
{
return(currentData.CurrentExpression + NumberStandardization.Standardization(calculate.CalcPercentage(NumberStandardization.Standardization(currentData.CurrentNumber), ((int)Digits.Zero).ToString()).ToString()));
}
}
}
/// <summary>
/// To change the current expression depending on the pressed operation and the state of the buttons
/// </summary>
private string NewCurrentExpression(BasicMathOperations pressedOperation)
{
//If the expression was calculated and "=" was pressed again
if (buttonsState.EqualBtnPressed && (pressedOperation == BasicMathOperations.Equal) && Common.MathSignCheck(currentData.CurrentExpression))
{
return(NumberStandardization.Standardization(currentData.CurrentNumber) + CopyLastOperation(currentData.CurrentExpression.Remove(currentData.CurrentExpression.Length - 3, 3)) + SetSelectedBasicMathOperation(pressedOperation));
}
else if (pressedOperation == BasicMathOperations.Sqr)
{
return(SetSelectedBasicMathOperation(pressedOperation) + NumberStandardization.StandardizationSqr(currentData.CurrentNumber));
}
else if (pressedOperation == BasicMathOperations.Sqrt)
{
return(SetSelectedBasicMathOperation(pressedOperation) + NumberStandardization.StandardizationSqr(currentData.CurrentNumber));
}
else if (pressedOperation == BasicMathOperations.PartOfTheWhole)
{
return(SetSelectedBasicMathOperation(pressedOperation) + NumberStandardization.StandardizationSqr(currentData.CurrentNumber));
}
else if (buttonsState.NumberPadBtnPressed)
{
return(currentData.CurrentExpression + NumberStandardization.Standardization(currentData.CurrentNumber) + SetSelectedBasicMathOperation(pressedOperation));
}
//Сhanging the basic math operation sign
else
{
return(ChangeOperation(currentData.CurrentExpression, SetSelectedBasicMathOperation(pressedOperation)));
}
}
/// <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);
}
}
/// <summary>
/// To change the current expression depending on the pressed operation and the state of the buttons
/// </summary>
private string NewCurrentExpression(BasicMathOperations pressedOperation)
{
//If the expression was calculated and "=" was pressed again
if (buttonsState.EqualBtnPressed && (pressedOperation == BasicMathOperations.Equal) && Common.MathSignCheck(currentData.CurrentExpression))
{
return(NumberStandardization.Standardization(currentData.CurrentNumber) + CopyLastOperation(currentData.CurrentExpression.Remove(currentData.CurrentExpression.Length - 3, 3)) + SetSelectedBasicMathOperation(pressedOperation));
}
//If the number and additional operation were pressed
else if (buttonsState.NumberPadBtnPressed && buttonsState.AdditionalOperationBtnPressed)
{
return(currentData.CurrentExpression + SetSelectedBasicMathOperation(pressedOperation));
}
//If a number was pressed, but not an additional operation
else if (buttonsState.NumberPadBtnPressed && !buttonsState.AdditionalOperationBtnPressed)
{
return(currentData.CurrentExpression + NumberStandardization.Standardization(currentData.CurrentNumber) + SetSelectedBasicMathOperation(pressedOperation));
}
//Сhanging the basic math operation sign
else
{
return(ChangeOperation(currentData.CurrentExpression, SetSelectedBasicMathOperation(pressedOperation)));
}
}
/// <summary>
/// To change the current expression depending on the pressed operation and the state of the buttons
/// </summary>
private string NewCurrentExpression(AdditionalOperations pressedOperation)
{
//If an additional operation is not used for the first time
if (buttonsState.AdditionalOperationBtnPressed)
{
return(ChangeTheSetOfRecentAdditionalOperations(currentData.CurrentExpression, SetSelectedAdditionalOperation(pressedOperation)));
}
else
{
return(currentData.CurrentExpression + SetSelectedAdditionalOperation(pressedOperation) + '(' + NumberStandardization.Standardization(currentData.CurrentNumber) + ')');
}
}