public void Visit(AdditionExpression5 obj)
{
sb.Append("(");
obj.Left.Accept(this);
sb.Append("+");
obj.Right.Accept(this);
sb.Append(")");
}
// change to Main to run.
public static void none()
{
var e = new AdditionExpression5(
left: new DoubleExpression5(1),
right: new AdditionExpression5(
left: new DoubleExpression5(2),
right: new DoubleExpression5(3)));
var ep = new ExpressionPrinter4();
ep.Visit(e);
Console.WriteLine(ep.ToString());
}