Binary Search Tree Program in C

July 7, 2023

Searching in Binary Search Tree in C

Here, in this page we will discuss searching in binary search tree in C. A binary search tree is a tree in which the data in left sub-tree is less than the root and the data in right sub-tree is greater than the root.Given a Binary Search tree and a key, check whether the key is present in the tree or not.

Algorithm :

If tree is empty return.
Check whether key is greater or smaller than root.
If greater, move to the right subtree. Otherwise move to the left subtree.
If Key is found return true.

Priority Queue in C

Tree Traversals: Inorder Postorder Preorder

Inorder Tree Traversal in Binary Tree

Inorder Tree Traversal without Recursion

Preorder Tree Traversal without Recursion

Code in C for Searching in Binary Search Tree

Run

#include <stdio.h>
#include <stdlib.h>
#include <stdbool.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);
}

bool check_element (struct node * root, int key)
{
  // If root is null, element is not found:Backtrack 
  if (root == NULL)
    {
      return false;
    }
  // Check whether same or not
  if (root->data == key)
    {
      return true;
    }

  if (root->data > key)
    {
      // Traverse the left subtree
      return check_element (root->left, key);
    }
  // Else Traverse the right subtree
  else
    {
      return check_element (root->right, key);
    }
}

int main ()
{
  struct node *root = newNode (80);
  root->left = newNode (60);
  root->right = newNode (90);
  root->left->left = newNode (40);
  root->left->right = newNode (70);
  root->left->left->left = newNode (30);
  root->left->left->right = newNode (50);
  if (check_element (root, 50))
    {
      printf ("Found\n");
    }
  else
    {
      printf ("Not Found\n");
    }
  return 0;
}

Output :

Found

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Introduction to Trees

Binary Trees

Binary Tree in Data Structures (Introduction)
Tree Traversals: Inorder Postorder Preorder : C | C++ | Java
Inorder Postorder PreOrder Traversals Examples
- Inorder Tree Traversal in Binary Tree: C | C++ | Java
- Preorder Tree Traversal in Binary Tree : C | C++ | Java
- Postorder Tree Traversal in Binary Tree : C | C++ | Java
Tree Traversal without Recursion
- Postorder Preorder Inorder Traversal without recursion
- Inorder Tree Traversal without Recursion – C | C++ | Java
- Preorder Tree Traversal without Recursion – C | C++ | Java
- Postorder Tree Traversal without Recursion – C | C++ | Java

Binary Search Trees

Binary search tree in Data Structures (Introduction)
- BST: Introduction to Binary Search Tree
- BST: Binary Search Tree Program : C | C++ | Java
- BST: Search a node in Binary Search Tree : C | C++ | Java
- BST: Insertion in a Binary Search Tree : C | C++ | Java
- BST: Deletion in a Binary Search Tree : C | C++ | Java

Traversals

Traversal in Trees
Tree Traversals: Breadth-First Search (BFS) : C | C++ | Java
Tree Traversals: Depth First Search (DFS) : C | C++ | Java
Construct a Binary Tree from Postorder and Inorder

B – Trees

B-Tree
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- B-Tree: Insertion : C | C++ | Java
- B-Tree: Deletion : C | C++ | Java

AVL Trees

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- Insertion in a Binary Tree (Level Order) – C | C++ | Java
- Searching in Binary Tree – C | C++ | Java
- Searching in a Binary Search Tree – C | C++ | Java

Complete Programs for Trees

Depth First Traversals – C | C++ | Java
Level Order Traversal – C | C++ | Java
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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Hand shaking lemma and some Impotant Tree Properties.
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check whether tree is Symmetric – C| C++| Java.
Check for Children-Sum in Binary Tree- C|C++| Java
Sum of all nodes in Binary Tree- C | C++ | Java
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