public void Visit(AdditionalExpression ae)
{
sb.Append("(");
ae.Left.Accept(this);
sb.Append("+");
ae.Right.Accept(this);
sb.Append(")");
}
public void Visit(AdditionalExpression ae)
{
ae.Left.Accept(this);
var a = Result;
ae.Right.Accept(this);
var b = Result;
Result = a + b;
}
static void Main(string[] args)
{
var e = new AdditionalExpression(
new DoubleExpression(1),
new AdditionalExpression(
new DoubleExpression(3),
new DoubleExpression(4)));
var printer = new ExpressionPrinter();
printer.Visit(e);
WriteLine(printer);
var calculator = new ExpressionCalculator();
calculator.Visit(e);
WriteLine($"{printer} = {calculator}");
ReadKey();
}