private StackItemOperator TryGetOperatorFromString(string item, int pos)
{
StackItemOperator stackItem = null;
switch (item)
{
case "+":
stackItem = new StackItemOperator(OperatorType.Addition, pos);
break;
case "-":
stackItem = new StackItemOperator(OperatorType.Subtraction, pos);
break;
case "*":
stackItem = new StackItemOperator(OperatorType.Multiplication, pos);
break;
case "/":
stackItem = new StackItemOperator(OperatorType.Division, pos);
break;
case var s when s.ToUpper().Equals("SQRT"):
stackItem = new StackItemOperator(OperatorType.Sqrt, pos);
break;
case var s when s.ToUpper().Equals("UNDO"):
stackItem = new StackItemOperator(OperatorType.Undo, pos);
break;
case var s when s.ToUpper().Equals("CLEAR"):
stackItem = new StackItemOperator(OperatorType.Clear, pos);
break;
case var s when s.ToUpper().Equals("UNDO"):
stackItem = new StackItemOperator(OperatorType.Undo, pos);
break;
}
return(stackItem);
}
public decimal?ExecuteMathOperator(StackItemOperator itemOperator, decimal number1, decimal number2 = 0)
{
if (itemOperator == null)
{
throw new ArgumentNullException(nameof(itemOperator));
}
switch (itemOperator.Operator)
{
case OperatorType.Sqrt:
if (number1 < 0)
{
throw new ArgumentOutOfRangeException(nameof(number1));
}
decimal root = number1 / 3;
int i;
for (i = 0; i < 32; i++)
{
root = (root + number1 / root) / 2;
}
return(root);
case OperatorType.Addition:
return(number1 + number2);
case OperatorType.Subtraction:
return(number1 - number2);
case OperatorType.Multiplication:
return(number1 * number2);
case OperatorType.Division:
return(number1 / number2);
}
return(null);
}
public InsufficientParameterException(StackItemOperator itemOperator)
{
Operator = itemOperator;
}