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#include "btree.h"
#include <stdio.h>
#include <stdlib.h>
/**
* Print a visual representation of an binary tree.
*
* @param tree The subtree to print
* @param level The level in the tree that this subtree is in
*/
static void inspect(BTree *tree, int level) {
if (!tree)
return;
for (int i = 0; i < level; i++)
printf(" ");
printf("%2d\n", tree->data);
inspect(tree->left, level + 1);
inspect(tree->right, level + 1);
}
/**
* Initializes an instance of an binary tree.
*
* @param data The value to assign to the new node in the tree.
* @return Returns the new binary tree node instance.
*/
BTree *btree_initialize(int data) {
BTree *tree = malloc(sizeof(BTree));
tree->left = NULL;
tree->right = NULL;
tree->data = data;
return tree;
}
/**
* Inserts a new value into a binary subtree.
*
* @param tree The subtree to attempt to insert a new value into.
* @param data The data to insert into the tree.
* @return Returns the new root of the subtree.
*/
BTree *btree_insert(BTree *tree, int data) {
if (!tree)
return btree_initialize(data);
if (data <= tree->data)
if (tree->left)
btree_insert(tree->left, data);
else
tree->left = btree_initialize(data);
else if (tree->right)
btree_insert(tree->right, data);
else
tree->right = btree_initialize(data);
return tree;
}
/**
* Returns the height of a binary subtree.
*
* @param tree The subtree to interrogate.
* @return The height of the subtree
*/
int btree_height(BTree *tree) {
if (tree == NULL)
return 0;
int left = btree_height(tree->left);
int right = btree_height(tree->right);
return (left > right) ? left + 1 : right + 1;
}
/**
* Prints a visual inspection of
* a binary tree for debugging purposes to stdout.
*
* @param tree The tree to visualize
*/
void btree_inspect(BTree *tree) { inspect(tree, 0); }
int btree_leaves(BTree *tree) {
if (tree == NULL)
return 0;
if (tree->left == NULL && tree->right == NULL)
return 1;
return btree_leaves(tree->left) + btree_leaves(tree->right);
}
/**
* Generates a binary tree with a desired number of leaf
* nodes.
*
* @param leaves The total number of leaf nodes to generate in the tree.
* @return Returns a new binary tree.
*/
BTree *btree_generate(int leaves) {
BTree *tree = NULL;
while (btree_leaves(tree) < leaves)
tree = btree_insert(tree, rand());
return tree;
}
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