52 lines
1.5 KiB
C
52 lines
1.5 KiB
C
#include <stdio.h>
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#include <stdlib.h>
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typedef struct TreeNode {
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int val;
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struct TreeNode *left;
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struct TreeNode *right;
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} TreeNode;
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TreeNode* createNode(int value) {// 创建新节点
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TreeNode *newNode = (TreeNode*)malloc(sizeof(TreeNode));
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newNode->val = value;
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newNode->left = NULL;
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newNode->right = NULL;
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return newNode;
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}
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void preorderTraversal(TreeNode *root) {
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if (root == NULL) return;
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printf("%d ", root->val); // 访问根节点
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preorderTraversal(root->left); // 遍历左子树
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preorderTraversal(root->right); // 遍历右子树
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}
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void inorderTraversal(TreeNode *root) {
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if (root == NULL) return;
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inorderTraversal(root->left); // 遍历左子树
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printf("%d ", root->val); // 访问根节点
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inorderTraversal(root->right); // 遍历右子树
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}
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void postorderTraversal(TreeNode *root) {
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if (root == NULL) return;
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postorderTraversal(root->left); // 遍历左子树
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postorderTraversal(root->right); // 遍历右子树
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printf("%d ", root->val); // 访问根节点
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}
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int main() {
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// 创建二叉树
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TreeNode *root = createNode(1);
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root->left = createNode(2);
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root->right = createNode(3);
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root->left->left = createNode(4);
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root->left->right = createNode(5);
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printf("前序遍历: ");
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preorderTraversal(root);
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printf("\n");
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printf("中序遍历: ");
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inorderTraversal(root);
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printf("\n");
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printf("后序遍历: ");
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postorderTraversal(root);
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printf("\n");
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return 0;
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}
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