public override double?performOperation(ICalculationOperation operation)
{
CalculationOperation.SecondArgument = operation.SecondArgument;
CalculationOperation.Operation();
double result = CalculationOperation.Result.Value;
calculatorUser.CalculatorHistory?.AddToHistory(CalculationOperation);
if (!(operation is EqualsOperation))
{
operation.FirstArgument = CalculationOperation.Result;
CalculationOperation = operation;
reset = true;
}
else
{
calculatorUser.CalculatorState = new InitialCalculatorState(calculatorUser);
}
return(result);
}
