C Program For Binary Search Tree

 

C PROGRAM FOR BINARY SEARCH TREE

CODE

#include<stdio.h>

#include<stdlib.h>

struct Node

{

int data;

struct Node *left;

struct Node *right;

};

struct Node* create(int data)

{

struct Node *p=(struct Node*)malloc(sizeof(struct Node));

p->left=NULL;

p->right=NULL;

p->data=data;

}

int isBST(struct Node *root)

{

static struct Node *previous=NULL;

if(root!=NULL)

{

if(!isBST(root->left))

return 0;

if(previous!=NULL && (root->data <= previous->data))

return 0;

previous=root;

isBST(root->right);

}

else

{

return 1;

}

}

void inorder(struct Node *n)

{

if(n!=NULL)

{

inorder(n->left);

printf("%d ",n->data);

inorder(n->right);

}

}

int main()

{

struct Node *p=create(5);

struct Node *p1=create(3);

struct Node *p2=create(9);

struct Node *p3=create(1);

struct Node *p4=create(4);

struct Node *p5=create(6);

struct Node *p6=create(11);

p->left=p1;

p->right=p2;

p2->right=p2;

p1->left=p3;

p1->right=p4;

p2->left=p5;

p2->right=p6;

printf("The inorder traversal is: ");

inorder(p);

if(isBST(p))

{

printf("\nThe tree is a Binary Search Tree\n");

}

else

{

printf("\nThe tree is not Binary Search Tree\n");

}

return 0; 

}

OUTPUT