public static bool IsEquationValid(string _input)
{
if (string.IsNullOrEmpty(_input))
{
return(false);
}
var hasInvalidCharacter = _input.Any(_character =>
!(EquationHelper.IsCharacterNumber(_character) ||
EquationHelper.IsCharacterOperator(_character) ||
(EquationHelper.IsBracketsValid(_input, EquationHelper.IsCharacterBracket(_character)) && EquationHelper.IsCharacterBracket(_character))));
if (hasInvalidCharacter)
{
return(false);
}
if (EquationHelper.IsNumberMultipleDecimal(_input))
{
return(false);
}
if (EquationHelper.IsLastCharacterAOperator(_input))
{
return(false);
}
if (EquationHelper.IsOperatorDuplicated(_input))
{
return(false);
}
return(true);
}
public double CalculateEquation(string equation)
{
var numberCharacterBuilder = new StringBuilder();
var numbers = new List <int>();
var operators = new List <char>();
double result = 0;
int counter = 0;
var Operation = new OperatorFactory();
calcManager = new CalculationManager();
var updatedPreviousResult = 0;
var updatedCurrentValue = 0;
foreach (var character in equation)
{
if (EquationHelper.IsCharacterNumber(character))
{
numberCharacterBuilder.Append(character);
}
else
{
if (NumbersListValidator.IsListEmpty(numbers))
{
updatedPreviousResult = UpdateCalcManagerPrevious(numbers, numberCharacterBuilder.ToString());
numberCharacterBuilder.Clear();
}
else
{
updatedCurrentValue = UpdateCalcManagerCurrent(numbers, numberCharacterBuilder.ToString());
numberCharacterBuilder.Clear();
var NextOperation = Operation.GetOperator(operators[counter - 1]);
result = NextOperation.DoMaths(updatedPreviousResult, updatedCurrentValue);
updatedPreviousResult = UpdateCalcManagerPrevious(numbers, result.ToString());
}
counter++;
operators.Add(character);
}
}
updatedCurrentValue = UpdateCalcManagerCurrent(numbers, numberCharacterBuilder.ToString());
var LastOperation = Operation.GetOperator(operators[operators.Count() - 1]);
result = LastOperation.DoMaths(updatedPreviousResult, updatedCurrentValue);
return(result);
}