The document outlines the implementation of a recursive function named 'countnodes' to count the nodes in a binary tree. It defines a structure for a tree node and includes a class member function 'getlength' that utilizes 'countnodes'. Specific code implementation details are suggested to be added within the provided function structure.

1. Implement the recursive function "CountNodes" of a binary tree. struct TreeNode { ItemType
info; TreeNode* left; TreeNode* right; }; int CountNodes(TreeNode* tree); // Prototype int
TreeType::GetLength() const // Class member function return CountNodes(root); } int
CountNodes(TreeNode* tree) // Recursive function that counts the nodes { // Add your code
here