Hi I'm new to coding. Can someone please help with a linked list problem. I'm getting numbers for output, I think they are addresses. The output I'm getting is:
HEAD CODE
-12086434400
1080131584
TAIL CODE

The output I need is:
HEAD CODE
<rect x="0" y="0" width ="200" height="200" stroke-width="2" stroke="red" fill="none" />
<rect x="14" y="140" width ="140" height="14" stroke-width="2" stroke="red" fill="none" />
TAIL CODE

I know it has something to do with the switch. I know that code is right but I'm not utilising it.

Thanks

#include <iostream>
#include <string>
#include <cassert>
using namespace std;

class Path
{
public:
//stub
}; // Path

class Circle
{
public:
//stub
}; // Circle

class Rectangle
{
public:
    Rectangle();
    Rectangle(double x, double y, double w, double h, string c = "red", string f = "none");
    void Print(ostream & out) const;
private:
    double rx, ry, width, height;
    string colour, fill;
};

ostream & operator<<(ostream & out, const Rectangle & rectangle);


class DataType
{
 public:
  enum { EMPTY, PATH, CIRCLE, RECTANGLE } SVGObj;
  union
  {
    Path *path;
    Circle *circle;
    Rectangle *rectangle;
  };
  DataType();
  DataType(const DataType &);
  DataType(const Circle & obj);
  DataType(const Path & obj);
  DataType(const Rectangle & obj);

};


struct LNode
{
  DataType data;
  LNode *next;
};

typedef LNode* LNodePtr;


class Svg
{
  public:
    Svg(double w, double h);
    ~Svg(); //destructor
    void Head(ostream & out) const;
    void Tail(ostream & out) const;
    void Print(ostream & out) const;
    void Append(const Path & obj);
    void Append(const Circle & obj);
    void Append(const Rectangle & obj);

    friend ostream & operator<<(ostream & out,const Svg & aList);
  private:
    LNodePtr head;
    int size; //size of list

    double myWidth;
    double myHeight;
};

Rectangle::Rectangle(double x, double y, double w, double h, string c, string f)
{
	rx = x;
	ry = y;
	width = w;
	height = h;
	colour = c;
	fill = f;
} // Rectangle


void Rectangle::Print(ostream & out) const
{
  out << "\n<rect x=\"" << rx << "\" y=\"" << ry << "\" width=\"" << width << "\" height=\"" << height
       << "\" stroke-width=\"" << 2 << "\" stroke=\"" << colour << "\" fill=\"" << fill << "\" />" << endl;

} // Rectangle Print


ostream & operator<<(ostream & out, const Rectangle & rectangle)
{
	rectangle.Print( out );
	return out;
} // Rectangle operator<<


// CONSTRUCTOR
DataType::DataType()
{
  SVGObj = EMPTY;
}

DataType::DataType(const DataType & orig)
{
  switch(orig.SVGObj)
  {
  case PATH:
    path = new Path (*orig.path);
    assert(path != NULL);
    break;

  case CIRCLE:
    circle = new Circle (*orig.circle);
    assert(circle != NULL);
    break;

  case RECTANGLE:
    rectangle = new Rectangle (*orig.rectangle);
    assert(rectangle != NULL);
    break;

  case EMPTY:
    break;
  }
  SVGObj = orig.SVGObj;
}

DataType::DataType(const Rectangle & obj)
{
  cout << obj;  // this is wrong but I can't fix it
}

ostream & operator<<(ostream& out, const DataType& aDataType)
{
 out << aDataType.SVGObj ;
 return out ;
}


Svg::Svg(double w, double h)
{
  head = NULL;
  size = 0;
  myWidth = w;
  myHeight = h;
}

//destructor
Svg::~Svg()
{
  LNodePtr temp;
  while (head != NULL)
    {
      temp = head;
      head = head-> next;
      delete temp;
    }
  size = 0;
}

void Svg::Head(ostream & out) const
{
  out << "HEAD CODE" << endl;
} // sample data

// XML CLOSING TAG
void Svg::Tail(ostream & out) const
{
  out << "TAIL CODE" << endl;
} // sample data


void Svg::Append(const Rectangle & obj)
{
   LNodePtr temp;
  temp =  new LNode;
  if (temp == 0)
    {
      cerr <<"\n***No more memory!\n";
      exit(1);
    }
  temp->data = obj;
//  temp->next = NULL;

  if (head == NULL) //empty list
    head = temp;
  else //at least one node
    {
      LNodePtr current = head; 
      //traverse list 
      while (current->next != NULL) 
	current = current->next; 
      //insert node at end of list 
      current->next = temp;
    }
}


ostream & operator<<(ostream & out, const Svg & aList)
{
  LNodePtr temp = aList.head;
  aList.Head(out);
  while(temp != NULL)
  {
    out << temp->data << endl;
    temp = temp->next;
  }
  aList.Tail(out);
  return out;
}




void Page( Svg & graph, double left, double bottom, double right, double top );

int main()
{



    Svg pattern( 200, 200 );                           // initialize Svg object
    Page( pattern, 0, 0, 200, 200 );
    cout << pattern;

    return 0;

} // main


void Page( Svg & graph, double left, double bottom, double right, double top )
{
        Rectangle rectangle(left, bottom, right, top );   // create the middle rectangle
        graph.Append(rectangle);
	Rectangle rectangle2(14, 140, 140, 14);
	graph.Append(rectangle2);
}

I have to leave now. But at a glance I saw that you use a strange way to print your rectangle class. Have you heard of friend functions? declare the operator<< function as a friend of rectangle.

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