Calculate size of a tree

Calculating the size of a tree means determining the total number of nodes in the tree. In simple terms, a tree is a data structure made up of nodes, where each node has a value and can have zero or more child nodes. The size of a tree refers to the total number of nodes present in the entire tree, including the root node, all its children, and their children, and so on. Counting the nodes of a tree is a common operation in computer science, and it can be useful in various applications such as analyzing algorithms, evaluating the complexity of a problem, or optimizing memory usage.

Number of node in tree is called size of tree. Here given best solution of this problem which is solve by recursion.

1) Count number of nodes in binary tree in java 2) Count number of nodes in binary tree in c++ 3) Count number of nodes in binary tree in c 4) Count number of nodes in binary tree in golang 5) Count number of nodes in binary tree in c# 6) Count number of nodes in binary tree in vb.net 7) Count number of nodes in binary tree in php 8) Count number of nodes in binary tree in node js 9) Count number of nodes in binary tree in typescript 10) Count number of nodes in binary tree in python 11) Count number of nodes in binary tree in ruby 12) Count number of nodes in binary tree in scala 13) Count number of nodes in binary tree in swift 14) Count number of nodes in binary tree in kotlin