Breaking News: Grepper is joining You.com. Read the official announcement!

c program for threaded binary tree

Saurabh Bharali answered on February 18, 2022 Popularity 5/10 Helpfulness 6/10

answer c program for threaded binary tree

c program for threaded binary tree

Comment

// Insertion in Threaded Binary Search Tree. 
#include<bits/stdc++.h> 
using namespace std; 
  
struct Node 
{ 
    struct Node *left, *right; 
    int info; 
  
    // True if left pointer points to predecessor 
    // in Inorder Traversal 
    bool lthread; 
  
    // True if right pointer points to predecessor 
    // in Inorder Traversal 
    bool rthread; 
}; 
  
// Insert a Node in Binary Threaded Tree 
struct Node *insert(struct Node *root, int ikey) 
{ 
    // Searching for a Node with given value 
    Node *ptr = root; 
    Node *par = NULL; // Parent of key to be inserted 
    while (ptr != NULL) 
    { 
        // If key already exists, return 
        if (ikey == (ptr->info)) 
        { 
            printf("Duplicate Key !
"); 
            return root; 
        } 
  
        par = ptr; // Update parent pointer 
  
        // Moving on left subtree. 
        if (ikey < ptr->info) 
        { 
            if (ptr -> lthread == false) 
                ptr = ptr -> left; 
            else
                break; 
        } 
  
        // Moving on right subtree. 
        else
        { 
            if (ptr->rthread == false) 
                ptr = ptr -> right; 
            else
                break; 
        } 
    } 
  
    // Create a new node 
    Node *tmp = new Node; 
    tmp -> info = ikey; 
    tmp -> lthread = true; 
    tmp -> rthread = true; 
  
    if (par == NULL) 
    { 
        root = tmp; 
        tmp -> left = NULL; 
        tmp -> right = NULL; 
    } 
    else if (ikey < (par -> info)) 
    { 
        tmp -> left = par -> left; 
        tmp -> right = par; 
        par -> lthread = false; 
        par -> left = tmp; 
    } 
    else
    { 
        tmp -> left = par; 
        tmp -> right = par -> right; 
        par -> rthread = false; 
        par -> right = tmp; 
    } 
  
    return root; 
} 
  
// Returns inorder successor using rthread 
struct Node *inorderSuccessor(struct Node *ptr) 
{ 
    // If rthread is set, we can quickly find 
    if (ptr -> rthread == true) 
        return ptr->right; 
  
    // Else return leftmost child of right subtree 
    ptr = ptr -> right; 
    while (ptr -> lthread == false) 
        ptr = ptr -> left; 
    return ptr; 
} 
  
// Printing the threaded tree 
void inorder(struct Node *root) 
{ 
    if (root == NULL) 
        printf("Tree is empty"); 
  
    // Reach leftmost node 
    struct Node *ptr = root; 
    while (ptr -> lthread == false) 
        ptr = ptr -> left; 
  
    // One by one print successors 
    while (ptr != NULL) 
    { 
        printf("%d ",ptr -> info); 
        ptr = inorderSuccessor(ptr); 
    } 
} 
  
// Driver Program 
int main() 
{ 
    struct Node *root = NULL; 
  
    root = insert(root, 20); 
    root = insert(root, 10); 
    root = insert(root, 30); 
    root = insert(root, 5); 
    root = insert(root, 16); 
    root = insert(root, 14); 
    root = insert(root, 17); 
    root = insert(root, 13); 
  
    inorder(root); 
  
    return 0; 
}

Popularity 5/10 Helpfulness 6/10 Language c

Source: tutorialspoint.dev

Tags: binary-tree c

Link to this answer
Share Copy Link

Contributed on Feb 18 2022

Saurabh Bharali

0 Answers Avg Quality 2/10

c program for threaded binary tree

Contents

More Related Answers

c program for threaded binary tree

Grepper

Documentation

Social

Legal

Contact

Oops, You will need to install Grepper and log-in to perform this action.