public void Visit(AdditionExpression obj)
{
sb.Append("(");
obj.Left.Accept(this);
sb.Append("+");
obj.Right.Accept(this);
sb.Append(")");
}
public static void Run()
{
Console.WriteLine($"== {typeof(Example).FullName} ==");
Expression e = new AdditionExpression(
new DoubleExpression(1),
new AdditionExpression(
new DoubleExpression(2),
new DoubleExpression(3)));
var ep = new ExpressionPrinter();
ep.Visit(e);
Console.WriteLine(ep.ToString());
}