1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 | #include <stdio.h>
#include <stdlib.h>
#include <stdbool.h>
#include <assert.h>
#include "miniunit.h"
typedef struct _BSTNode {
int value;
struct _BSTNode* left;
struct _BSTNode* right;
} BSTNode;
void insert(int value, BSTNode** a_root) {
if(*a_root == NULL) { // If the tree is empty...
// Create a tree of size 1
BSTNode* new_node = malloc(sizeof(*new_node));
*new_node = (BSTNode) { .value = value, .left = NULL, .right = NULL };
// Replace root with our newly created tree of size 1
*a_root = new_node; // fine for tree of size 1
}
else if(value < (*a_root) -> value) { // If value is < value at the root
// Insert the value into the left subtree of root.
// BSTNode* left_subtree = (*a_root) -> left; // BUG!!!
// insert(value, &left_subtree); // BUG!!!
insert(value, &((*a_root) -> left)); // need to modify field within struct object
}
else { // If value is ≥ value at the root
// Insert the value into the right subtree of root.
// BSTNode* right_subtree = (*a_root) -> right; // BUG!!!
// insert(value, &right_subtree); // BUG!!!
insert(value, &((*a_root) -> right)); // need to modify field within struct object
}
}
void print_bst(BSTNode* root) {
if(root != NULL) {
print_bst(root -> left);
printf("%d\n", root -> value);
print_bst(root -> right);
}
}
void destroy_bst(BSTNode** a_root) {
if(*a_root != NULL) {
destroy_bst(& (*a_root) -> left);
destroy_bst(& (*a_root) -> right);
free(*a_root);
*a_root = NULL;
}
}
int main(int argc, char* argv[]) {
// size == 0 (empty tree)
BSTNode* root = NULL;
insert(4, &root);
insert(2, &root);
insert(1, &root);
insert(3, &root);
insert(6, &root);
insert(5, &root);
insert(7, &root);
assert(root -> value == 4);
assert(root -> left -> value == 2);
assert(root -> left -> left -> value == 1);
assert(root -> left -> right -> value == 3);
assert(root -> right -> value == 6);
assert(root -> right -> left -> value == 5);
assert(root -> right -> right -> value == 7);
assert(root -> right -> right -> left == NULL);
assert(root -> right -> right -> right == NULL);
assert(root -> right -> left -> left == NULL);
assert(root -> right -> left -> right == NULL);
assert(root -> left -> right -> left == NULL);
assert(root -> left -> right -> right == NULL);
assert(root -> left -> left -> left == NULL);
assert(root -> left -> left -> right == NULL);
print_bst(root);
destroy_bst(&root);
// TODO: Free the BST
return EXIT_SUCCESS;
}
/* vim: set tabstop=4 shiftwidth=4 fileencoding=utf-8 noexpandtab: */
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