##main()
List lF1;
List lF2;
List lSum;

lF1.insert(0, 0);
lF2.insert(1, 0);
lSum.insert(0, 0);

Node* f1 = lF1.begin();
Node* f2 = lF2.begin();
Node* sum = lSum.begin();
Node* tmpPtr;

*sum = *(*f1 + *f2);

f1 = f2;
f2 = sum;


##overloaded + (friend)
Node* operator + (const Node &leftSide, const Node &rightSide)
{
   Node* temp = new Node;
   temp->data = leftSide.data + rightSide.data;
   return temp;
}

##overloaded = (member)
Node& Node::operator = (const Node &rightSide)
{
   data = rightSide.data;

   return *this;
}