public void Print(AdditionalExpression ae, StringBuilder sb)
{
sb.Append("(");
Print((dynamic)ae.Left, sb);
sb.Append("+");
Print((dynamic)ae.Right, sb);
sb.Append(")");
}
static void Main(string[] args)
{
var e = new AdditionalExpression(
new DoubleExpression(3),
new AdditionalExpression(
new DoubleExpression(4),
new DoubleExpression(5)));
var sb = new StringBuilder();
var ep = new ExpressionPrinter();
ep.Print((dynamic)e, sb);
Console.WriteLine(sb.ToString());
Console.ReadKey();
}
