public void Visit(AdditionExpresssion obj)
{
this.sb.Append("(");
obj.Left.Accept(this);
this.sb.Append("+");
obj.Right.Accept(this);
this.sb.Append(")");
}
public void Run()
{
var e = new AdditionExpresssion(
new DoubleExpresssion(1),
new AdditionExpresssion(
new DoubleExpresssion(2),
new DoubleExpresssion(3)
));
//ClassicVisitor(e);
var acyclic = new ExpresssionPrinter();
acyclic.Visit(e);
Console.WriteLine(acyclic);
}