Binary Search Tree- breadthFirst function Call

Question

I have the algorithm for void leveltraversal(ostream& out); but i am not sure how to call it in main () . In my Assignment we are not allowed to change the header file. Is there a way to call it without overloading it?

Update:

void BST::levelTraversal(ostream& out){
 queue<BST::BinNode*> q;
 BinNode* cur = myRoot;
 BinNode* top = NULL;
 q.push(cur);
 while(q.empty() != false){
  top = q.front();
  if(top->left != NULL){
   q.push(top->left);
  }
  if(top->right !=NULL){
   q.push(top->right);
  }
  out<<top->data;
  q.pop();
 }
}

Answer 1

The parameter, ostream&, takes any output stream, e.g. output file. The following example uses the standard output as an ostream:

BST myBst;
// insert elements into myBst
myBst.leveltraversal( std::cout );

Answer 2

If you can't change the function header, you can define global variables and reference them in both functions (main and leveltraversal).

Answer 3

this is what i have

void BST::levelTraversal(ostream& out){
 queue<BST::BinNode*> q;
 BinNode* cur = myRoot;
 BinNode* top = NULL;
 q.push(cur);
 while(q.empty() != false){
  top = q.front();
  if(top->left != NULL){
   q.push(top->left);
  }
  if(top->right !=NULL){
   q.push(top->right);
  }
  out<<top->data;
  q.pop();
 }
}