void DeleteNode(TreeNode*& tree)
// Deletes the node pointed to by tree.
// Post: The user's data in the node pointed to by tree is no
// longer in the tree. If tree is a leaf node or has only
// non-NULL child pointer the node pointed to by tree is
// deleted; otherwise, the user's data is replaced by its
// logical predecessor and the predecessor's node is deleted.
{
ItemType data;
TreeNode* tempPtr;
tempPtr = tree;
if (tree->left == NULL)
{
tree = tree->right;
delete tempPtr;
}
else if (tree->right == NULL)
{
tree = tree->left;
delete tempPtr;
}
else
{
GetPredecessor(tree->left, data);
tree->info = data;
Delete(tree->left, data); // Delete predecessor node.
}
}
void Tree::DeleteNode(TreeNode *&pTree){
Student data;
TreeNode* temp;
temp = pTree;
if(pTree->m_left == nullptr){
pTree = pTree->m_right;
delete temp;
}
else if(pTree->m_right == nullptr){
pTree = pTree->m_left;
delete temp;
}
else{
GetPredecessor(pTree->m_left,data);
pTree->m_student = data;
Delete(data.getID(),pTree->m_left);
}
}