Computer Programming
C Programming
The Difference Between

# Is null node equal to leaf node?

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###### 2015-02-06 16:36:17

No. A leaf node is a node that has no child nodes. A null node is a node pointer that points to the null address (address zero). Since a leaf node has no children, its child nodes are null nodes.

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###### 2015-03-05 14:52:35

No. A null node is a node pointer that holds the null value (zero). A leaf node is simply a node that has no children. Thus in a binary tree, a leaf node would hold two null nodes.

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## Related Questions

In this representation, each node contains two pointers, one pointing to its parent (null in the case of root node) and the other pointing to its child node (null in the case of leaf nodes).

#include &lt;stdio.h&gt; #include &lt;stdlib.h&gt; /* A binary tree node has data, pointer to left child and a pointer to right child */ struct node { int data; struct node* left; struct node* right; }; /* Function to get the count of leaf nodes in a binary tree*/ unsigned int getLeafCount(struct node* node) { if(node NULL &amp;&amp; node-&gt;right==NULL) return 1; else return getLeafCount(node-&gt;left)+ getLeafCount(node-&gt;right); } /* Helper function that allocates a new node with the given data and NULL left and right pointers. */ struct node* newNode(int data) { struct node* node = (struct node*) malloc(sizeof(struct node)); node-&gt;data = data; node-&gt;left = NULL; node-&gt;right = NULL; return(node); } /*Driver program to test above functions*/ int main() { /*create a tree*/ struct node *root = newNode(1); root-&gt;left = newNode(2); root-&gt;right = newNode(3); root-&gt;left-&gt;left = newNode(4); root-&gt;left-&gt;right = newNode(5); /*get leaf count of the above created tree*/ printf("Leaf count of the tree is %d", getLeafCount(root)); getchar(); return 0; }

int countleaves(struct node* root){ if(root!=null) { countleaves(root-&gt;left); if(root-&gt;left==NULL&amp;&amp;root-&gt;right==NULL) { count++; } countleaves(root-&gt;right); } }

height and depth of a tree is equal... but height and depth of a node is not equal because... the height is calculated by traversing from leaf to the given node depth is calculated from traversal from root to the given node.....

THE POINT FROM WHERE THE LEAF ARISES IS KNOWN AS NODE. THE DISTANCE between 2 consequitive nodes is known as internode.. from a node leaf arises but from the internode no leaf arises internode is a part of stem as node is not but is a part of leaf

as far as i know u have 4 cases for the node u wanna delete1.It's a leaf (has no children)2.It has only left child3.it has only right child4.it has both children ,left and rightnow, let's work on it :>set a pointer node to the rootwhile the element to be deleted doesnt equal the pointerif it's smaller, move the pointer to the left subtreeif it's large , move the pointer to the right subtreeif pointer reached the end of the tree , null, break the loop (unluckly that means u didnt find the element that should be removed)end while //(now u must have found the target, the while condition is breaked normally)// this is case 4if both children don't equal nullget the most left node in the subtree of the pointer nodeassign its value to the pointer node.remove it (set that most left thing to equal null)//...case 2if pointer node.right only equals nullpointer node = pointer node.left//...case3if pointer node.left only equals nullpointer node = pointer node.right//... case 1if pointer node.left and .right equals nullpointer node.data = nullmaybe it doesnt look like any algorithm style ,sorry for that, that's as far as i knw, i doubt case 4 anyways..

struct node{ int data; struct node *left, *right; }; typedef struct node node; non recursive method : main() { node * root = NULL , *new = NULL *temp1 =NULL , * temp2 = NULL; int num =1; printf(" Enter the elements of the tree( enter 0 to exit)\n"); while(1) { scanf("%d", &amp;num); if(num==0) break; new = malloc(sizeof(node)); new-&gt;left = new-&gt;right = NULL; new-&gt;data = num; if( root NULL) root-&gt;left = new; else insert( new,root-&gt;left); } }

Induction: 1. A tree of one node has two NULL-pointers. 2. Whenever you add a node to a tree, you remove one NULL-pointer (from the parent of the new node), and add two (the child's of the new node) in the same time.

Since a binary search tree is ordered to start with, to find the largest node simply traverse the tree from the root, choosing only the right node (assuming right is greater and left is less) until you reach a node with no right node. You will then be at the largest node.for (node=root; node!= NULL&&node->right != NULL; node=node->right);This loop will do this. There is no body because all the work is done in the control expressions.

Header node is a pointer variable of the structure type. This node contains the address of the first node of the linked list. If this node contains NULL, then this shows that linked list is empty.

Queues are a first in first out structure (FIFO). This means all extractions occur at the head of the list and all insertions occur at the tail. This requires that you maintain pointers to the head and tail node to allow constant time insertion and extraction of nodes. The nodes themselves are singly linked, each pointing to the next node. The tail node always points to NULL until a new node is insert, which the tail points to. The new node then becomes the tail. When extracting a head node, its next node (which may be NULL if it is also the last node) becomes the new head of the list. If the head is NULL, the tail is also set to NULL.

void delete_last (node **head) { node *tmp = *head; node *prev = NULL; if (!tmp) { } else if (!tmp-&gt;next) { free(tmp); *head = NULL; } else { while (tmp-&gt;next) { prev = tmp; tmp = tmp-&gt;next; } prev-&gt;next = NULL; free(tmp); } return; }

_node* search (_node* head, _key key) { _node* node; for (node=head; node != NULL;;) { if (key == node-&gt;key) return node; else if (key &lt; node.&gt;key) node = node-&gt;left; else node = node-&gt;right; } return node; }

int numNodes = 0; Node current = root; // if root is null, the number of nodes is 0 if(current != null) { // if root is not null, we have at least one node numNodes = 1; // count all nodes while(current .next != null) { ++numNodes; current = current.next; } }

node *SLSortWiseInsert(node *START, int data) { node *newnode; if(START NULL)) { printf("Inside this condition\n"); newnode = (node *)malloc(sizeof(node)); newnode-&gt;data = data; newnode-&gt;link = NULL; START-&gt;link = newnode; return START; } START-&gt;link = SLSortWiseInsert(START-&gt;link,data); return START; }

The primary difference is that the last node in a circular queue points to the head node (as its next node). In a non-circular queue, the last node points to NULL.

The petiole is the base of a leaf that is not a stem because it has a leaf node that consists of a leaf axil, a sheath and a stipule.It is use to hold the leaf in place and to carry nutriens to the leaf.The leaf node is bellow the petiole and connects the petiole to the stem.

It will be come a terminal node. Normally we call terminal nodes leaf nodes because a leaf has no branches other than its parent.

A node in binary tree is any element of the tree itself that could be either a root, leaf, or non-leaf.