wrote treeSize(), created treeSizeRec()

bintree.c

@@ -4,8 +4,8 @@
 
 
 //TODO: binären Suchbaum implementieren
-/*  * `addToTree`: fügt ein neues Element in den Baum ein (rekursiv),
-    * `clearTree`: gibt den gesamten Baum frei (rekursiv),
+/*  * `addToTree`: fügt ein neues Element in den Baum ein (rekursiv),       Done
+    * `clearTree`: gibt den gesamten Baum frei (rekursiv),                  Done
     * `treeSize`: zählt die Knoten im Baum (rekursiv),
     * `nextTreeData`: Traversierung mit Hilfe des zuvor implementierten Stacks. */
 
@@ -18,14 +18,17 @@
     void            clearTree       (TreeNode *root);
     unsigned int    treeSize        (const TreeNode *root);
 
-    // selfdeclaredfunctions
+    // self declared functions
     TreeNode        *addToTreeRec   (TreeNode *currentNode, TreeNode *newNode, CompareFctType compareFct, int *isDuplicate);
+    void            clearTreeRec    (TreeNode *currentNode);
+    void            clearNode       (TreeNode *node);
+    void            treeSizeRec     (const TreeNode *currentNode, unsigned int *nodeCount);
 
 
 // Adds a copy of data's pointer destination to the tree using compareFct for ordering. Accepts duplicates
 // if isDuplicate is NULL, otherwise ignores duplicates and sets isDuplicate to 1 (or to 0 if a new entry is added).
 
-//      returned Value is new root?
+//      returned Value is new root
 TreeNode *addToTree(TreeNode *root, const void *data, size_t dataSize, CompareFctType compareFct, int *isDuplicate)
 {
     // create a node
@@ -63,11 +66,11 @@ TreeNode *addToTreeRec(TreeNode *currentNode, TreeNode *newNode, CompareFctType
         //duplicate
         if (isDuplicate == NULL)
         {
-            return newNode;
+            currentNode->left = addToTreeRec(currentNode->left, newNode, compareFct, isDuplicate);
         }
         else
         {
-            isDuplicate = 1;
+            *isDuplicate = 1;
         }
     }
 
@@ -79,6 +82,8 @@ TreeNode *addToTreeRec(TreeNode *currentNode, TreeNode *newNode, CompareFctType
 // Iterates over the tree given by root. Follows the usage of strtok. If tree is NULL, the next entry of the last tree given is returned in ordering direction.
 // Use your implementation of a stack to organize the iterator. Push the root node and all left nodes first. On returning the next element,
 // push the top node and push all its left nodes.
+
+// Needs stack!!
 void *nextTreeData(TreeNode *root)
 {
 
@@ -88,13 +93,53 @@ void *nextTreeData(TreeNode *root)
 // Releases all memory resources (including data copies).
 void clearTree(TreeNode *root)
 {
+    clearTreeRec(root);
+}
 
+
+void clearTreeRec(TreeNode *currentNode)
+{
+    if (currentNode != NULL)
+    {
+        clearTree(currentNode->left);
+        clearNode(currentNode);
+        clearTree(currentNode->right);
+    }
+}
+
+
+void clearNode(TreeNode *node)
+{
+    free(node->data);
+    node->data  = NULL;
+
+    node->left  = NULL;
+    node->right = NULL;
+
+    free(node);
+    node        = NULL;
 }
 
 
 // Returns the number of entries in the tree given by root.
 unsigned int treeSize(const TreeNode *root)
-{
+{   
+    unsigned int amountOfNodes = 0;
 
+    
+    treeSizeRec(root, &amountOfNodes);
+
+
+    return amountOfNodes;
+}
+
+void treeSizeRec(const TreeNode *currentNode, unsigned int *nodeCount)
+{
+    if (currentNode != NULL)
+    {
+        treeSizeRec(currentNode->left, nodeCount);
+        *nodeCount++;
+        treeSizeRec(currentNode->right, nodeCount);
+    }
 }