public string ToOPN()
{
string finalOPNExpression = String.Empty;
Stack <char> operationsStack = new Stack <char>();
for (int i = 0; i < _expression.Length; i++)
{
if (Char.IsDigit(_expression[i]))
{
finalOPNExpression += _expression[i];
continue;
}
if (_expression[i] == '(')
{
operationsStack.Push(_expression[i]);
continue;
}
if (_expression[i] == ')')
{
while (operationsStack.Peek() != '(')
{
finalOPNExpression += operationsStack.Pop();
}
operationsStack.Pop();
continue;
}
if (_operationService.GetOperationByName(_expression[i]) != null)
{
while ((operationsStack.Count > 0) && (_operationService.GetOperationByName(operationsStack.Peek()).Priority <= _operationService.GetOperationByName(_expression[i]).Priority))
{
finalOPNExpression += operationsStack.Pop();
}
operationsStack.Push(_expression[i]);
continue;
}
}
while (operationsStack.Count > 0)
{
finalOPNExpression += operationsStack.Pop();
}
return(finalOPNExpression);
}
public double CalculateByOPN(string expressionOPN)
{
Stack <string> calculationsStack = new Stack <string>();
for (int i = 0; i < expressionOPN.Length; i++)
{
if (Char.IsDigit(expressionOPN[i]))
{
calculationsStack.Push(expressionOPN[i].ToString());
continue;
}
if (_operationService.GetOperationByName(expressionOPN[i]) != null)
{
double b = Convert.ToDouble(calculationsStack.Pop());
double a = Convert.ToDouble(calculationsStack.Pop());
double result = _operationService.GetOperationByName(expressionOPN[i]).ApplyTo(a, b);
calculationsStack.Push(result.ToString());
continue;
}
}
return(Convert.ToDouble(calculationsStack.Pop()));
}