Find Size of Binary Tree in C

March 9, 2023

Size of Binary Tree

Size of Binary tree is defined as the number of nodes in the given tree. It can be easily calculated using recursion and tree traversals. In this article this problem is solved using recursion.

Find Size of Binary Tree In C

Algorithm :

If node is empty, return NULL.
Otherwise, recursively call the size function for the left and right subtree.
Return 1 + sum of left and right subtree.

Construct Tree from given Postorder and Preorder traversal

Find the height of binary tree

Check whether two tree are identical

Spiral Order traversal of Tree

Check If binary tree if Foldable or not

Code For Find The Size of Binary Tree In C

Run

#include <stdio.h>
#include <stdlib.h>

struct node
{
  int data;
  struct node *left;
  struct node *right;
};

struct node *newNode (int data)
{
  struct node *node = (struct node *) malloc (sizeof (struct node));
  node->data = data;
  node->left = NULL;
  node->right = NULL;

  return (node);
}

int size (struct node *node)
{
  if (node == NULL)
    return 0;
  else
    return (size (node->left) + 1 + size (node->right));
}

int main ()
{
  struct node *root = newNode (10);
  root->left = newNode (20);
  root->right = newNode (30);
  root->left->left = newNode (40);
  root->left->right = newNode (50);

  printf ("Size of the tree is %d", size (root));
  getchar ();
  return 0;
}

Output:

Size of the tree is 5

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Introduction to Trees

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Inorder Postorder PreOrder Traversals Examples
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- Preorder Tree Traversal in Binary Tree : C | C++ | Java
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Construct Tree from given Inorder and Preorder traversals – C | C++ | Java
Construct Tree from given Postorder and Inorder traversals – C | C++ | Java
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