Lấy chiều cao

#include <stdio.h>
#include <string.h>
#include "avltree.h"

int main(void) {
    AVLTree* tree = AVLTree_create();
    char line[256];
    while (fgets(line, sizeof(line), stdin) != NULL) {
        line[strcspn(line, "\r\n")] = '\0';
        if (strcmp(line, "null") == 0) {
            printf("%d\n", AVLTree_getHeight(tree, NULL));
        }
        if (strcmp(line, "null") != 0) {
            int h;
            sscanf(line, "%d", &h);
            Node* n = Node_create(0);
            n->height = h;
            printf("%d\n", AVLTree_getHeight(tree, n));
        }
    }
    return 0;
}