public double Calculate(string expression)
{
var expressionUnitChecker = new ExpressionUnitChecker();
var helper = new PolyNotationReader(expressionUnitChecker, expression);
var result = helper.GetPolNotation();
var stackExpression = new Stack <double>();
foreach (var unit in result)
{
switch (unit)
{
case NumberExpressionUnit n:
stackExpression.Push(n.Number);
break;
case OperationExpressionUnit o:
stackExpression.Push(Calck(stackExpression.Pop(), stackExpression.Pop(), o));
break;
}
}
return(stackExpression.Peek());
}
public ExpressionReader(ExpressionUnitChecker expressionUnitChecker, string expression)
{
this.expressionUnitChecker = expressionUnitChecker;
this.expression = expression.Replace(" ", "");
}
public PolyNotationReader(ExpressionUnitChecker expressionUnitChecker, string expression)
{
this.expressionUnitChecker = expressionUnitChecker;
expressionReader = new ExpressionReader(expressionUnitChecker, expression.Replace(" ", ""));
}
