笔试面试 下面 C++ 代码的运行结果为() #include <iostream> using namespace std; struct TreeNode { int val; TreeNode *left; TreeNode *right; TreeNode() {} TreeNode(int value) : val(value) {} }; struct NewTreeNode : public TreeNode { int father; }; int main() { NewTreeNode newTreeNode; newTreeNode.father = -1; newTreeNode.val = -2; cout << newTreeNode.father << “, ” << newTreeNode.val << endl; }