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 | #include <stdio.h>
#include <stdlib.h>
#include <stdbool.h>
#include <assert.h>
typedef struct _BSTNode {
int value;
struct _BSTNode* left;
struct _BSTNode* right;
} BSTNode;
void insert(int value, BSTNode** a_root) {
if (*a_root == NULL) { // is tree empty?
BSTNode* new_node = malloc(sizeof(*new_node));
*new_node = (BSTNode) { .value = value, .left = NULL, .right = NULL };
*a_root = new_node;
// Next: let's do this without new_node variable.
}
}
int main(int argc, char* argv[]) {
// Empty tree
BSTNode* root = NULL;
// Insert a new node: 6
insert(value, &root);
// Type of root is BSTNode* (address of a BSTNode)
// Type of &root is BSTNode** (address of an address of a BSTNode)
return EXIT_SUCCESS;
}
/* vim: set tabstop=4 shiftwidth=4 fileencoding=utf-8 noexpandtab: */
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