c++有关类成员函数

 struct TreeNode {
     int val;
      TreeNode *left;
    TreeNode *right;
    TreeNode(int x, TreeNode *left, TreeNode *right) : val(x), left(left), right(right) {}//疑惑在这
  };

请问疑惑的地方，如果不简写，展开来写，是什么样的？想知道这个

struct TreeNode {
    int val;
    TreeNode *left;
    TreeNode *right;
    TreeNode(int x, TreeNode *left, TreeNode *right) 
    {
        val=x;
        this->left=left;
        this->right=right;
    } //val(x), left(left), right(right) {}//疑惑在这
};

对的

你可以参考一下

【leetcode刷题】二叉树篇_某可儿同学的博客的博客-CSDN博客 一、二叉树结点定义：struct TreeNode { int val; TreeNode *left; TreeNode *right; TreeNode() : val(0), left(nullptr), right(nullptr) {} TreeNode(int x) : val(x), left(nullptr), right(nullptr) {} TreeNode(int x, TreeNode *left, TreeNode *righ https://blog.csdn.net/weixin_41758646/article/details/114029275