#includeIn this example, we create a tree with 5 nodes and use getNodeX() function to get the x coordinate of the left child of the root node. Package library: Based on the function name, getNodeX(), and its context in the code example, it is likely that this function belongs to a package library related to tree data structures, such as boost::property_tree or the C++ Standard Template Library (STL) tree data structure.#include using namespace std; int main() { TreeNode* root = new TreeNode(5); root->left = new TreeNode(3); root->right = new TreeNode(8); root->left->left = new TreeNode(1); root->right->left = new TreeNode(6); // Retrieve the x coordinate of the left child of the root node int x = getNodeX(root->left); cout << "The x coordinate of the left child is: " << x << endl; return 0; }