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 | #include <stdio.h>
#include <stdlib.h>
#include <stdbool.h>
#include <assert.h>
typedef struct _BSTNode {
int value;
struct _BSTNode* left;
struct _BSTNode* right;
} BSTNode;
static void _print_bst_plain(BSTNode* root) {
}
void print_bst(BSTNode* root, char const* label) {
printf("%s: ", label);
_print_bst_plain(root);
printf("\n");
}
void insert(int value, BSTNode** a_root) {
if(*a_root == NULL) {
// If tree (or subtree) is empty, then insert the value here.
BSTNode* new_node = malloc(sizeof(*new_node));
*new_node = (BSTNode) { .value = value, .left = NULL, .right = NULL };
*a_root = new_node;
}
else if(value < (*a_root) -> value) { // Should this value go in the left subtree?
insert(value, &((*a_root) -> left));
}
else if(value >= (*a_root) -> value) { // ... or the right subtree?
insert(value, &((*a_root) -> right));
}
}
int main(int argc, char* argv[]) {
BSTNode* root = NULL;
print_bst(root, "Emtpy BST");
insert(4, &root);
assert(root != NULL); // Tree should no longer be empty.
assert(root -> value == 4); // Value at root should be 4
assert(root -> left == NULL);
assert(root -> right == NULL);
insert(2, &root);
assert(root -> left != NULL);
assert(root -> left -> value == 2);
assert(root -> left -> left == NULL);
assert(root -> left -> right == NULL);
insert(1, &root);
assert(root -> left -> left != NULL);
assert(root -> left -> left -> value == 1);
assert(root -> left -> left -> left == NULL);
assert(root -> left -> left -> right == NULL);
insert(3, &root);
assert(root -> left -> right != NULL);
assert(root -> left -> right -> value == 3);
assert(root -> left -> right -> left == NULL);
assert(root -> left -> right -> right == NULL);
insert(6, &root);
insert(5, &root);
insert(7, &root);
// TODO: Free memory (i.e., destroy_bst(…))
return EXIT_SUCCESS;
}
/* vim: set tabstop=4 shiftwidth=4 fileencoding=utf-8 noexpandtab: */
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