帮我用c语言写一个完整的二叉树功能代码，包括前序中序后序层序的构造创建变量销毁方法

好的，以下是一个完整的二叉树功能代码，包括前序、中序、后序、层序的构造、创建、变量销毁方法。

#include <stdio.h>
#include <stdlib.h>

typedef struct TreeNode {
    int data;
    struct TreeNode* left;
    struct TreeNode* right;
} TreeNode;

// 构造二叉树
TreeNode* buildTree(int* preorder, int* inorder, int preStart, int preEnd, int inStart, int inEnd) {
    if (preStart > preEnd || inStart > inEnd) {
        return NULL;
    }
    TreeNode* root = (TreeNode*)malloc(sizeof(TreeNode));
    root->data = preorder[preStart];
    int inorderRootIndex = inStart;
    for (int i = inStart; i <= inEnd; i++) {
        if (inorder[i] == preorder[preStart]) {
            inorderRootIndex = i;
            break;
        }
    }
    int leftSubTreeSize = inorderRootIndex - inStart;
    root->left = buildTree(preorder, inorder, preStart + 1, preStart + leftSubTreeSize, inStart, inorderRootIndex - 1);
    root->right = buildTree(preorder, inorder, preStart + leftSubTreeSize + 1, preEnd, inorderRootIndex + 1, inEnd);
    return root;
}

// 前序遍历
void preorderTraversal(TreeNode* root) {
    if (root != NULL) {
        printf("%d ", root->data);
        preorderTraversal(root->left);
        preorderTraversal(root->right);
    }
}

// 中序遍历
void inorderTraversal(TreeNode* root) {
    if (root != NULL) {
        inorderTraversal(root->left);
        printf("%d ", root->data);
        inorderTraversal(root->right);
    }
}

// 后序遍历
void postorderTraversal(TreeNode* root) {
    if (root != NULL) {
        postorderTraversal(root->left);
        postorderTraversal(root->right);
        printf("%d ", root->data);
    }
}

// 层序遍历
void levelorderTraversal(TreeNode* root) {
    if (root == NULL) {
        return;
    }
    TreeNode** queue = (TreeNode**)malloc(sizeof(TreeNode*) * 1000);
    int front = 0, rear = 0;
    queue[rear++] = root;
    while (front != rear) {
        TreeNode* node = queue[front++];
        printf("%d ", node->data);
        if (node->left != NULL) {
            queue[rear++] = node->left;
        }
        if (node->right != NULL) {
            queue[rear++] = node->right;
        }
    }
}

// 创建节点
TreeNode* createNode(int data) {
    TreeNode* node = (TreeNode*)malloc(sizeof(TreeNode));
    node->data = data;
    node->left = NULL;
    node->right = NULL;
    return node;
}

// 销毁节点
void destroyNode(TreeNode* node) {
    if (node != NULL) {
        free(node);
    }
}

// 销毁二叉树
void destroyTree(TreeNode* root) {
    if (root != NULL) {
        destroyTree(root->left);
        destroyTree(root->right);
        destroyNode(root);
    }
}

int main() {
    int preorder[] = { 1, 2, 4, 5, 3, 6 };
    int inorder[] = { 4, 2, 5, 1, 3, 6 };
    int length = sizeof(preorder) / sizeof(preorder[0]);
    TreeNode* root = buildTree(preorder, inorder, 0, length - 1, 0, length - 1);
    printf("前序遍历：");
    preorderTraversal(root);
    printf("\n中序遍历：");
    inorderTraversal(root);
    printf("\n后序遍历：");
    postorderTraversal(root);
    printf("\n层序遍历：");
    levelorderTraversal(root);
    printf("\n");
    destroyTree(root);
    return 0;
}

该代码实现了二叉树的构造、创建、遍历和销毁功能，可以根据前序和中序遍历构造二叉树，并且实现了四种遍历方式，同时也提供了创建和销毁节点的方法。