public double CalculateEquation(Equation equation)
{
ConvertToReversePolishNotation(equation);
var computeStack = new Stack();
foreach (var arg in _onpArguments)
{
if (IsVariable(arg))
{
computeStack.Push(arg);
}
else
{
var a = computeStack.Pop();
var b = computeStack.Pop();
var result = CalculateSingleExpression(double.Parse(a.ToString()), double.Parse(b.ToString()), (char)arg);
computeStack.Push(result);
}
}
return(double.Parse(computeStack.Pop().ToString()));
}