public override void VisitMatDecElement(MatDecElement element)
 {
     VisitElement(element.getLhs());
     VisitElement(element.getRhs());
     resultMessage += "matrix declaration element"+"\n";
 }
 public override void VisitMatDecElement(MatDecElement element)
 {
     VisitElement(element.getLhs());
        Console.Write(" ");
        VisitElement(element.getRhs());
 }
 public abstract void VisitMatDecElement(MatDecElement element);