C++ Program to Implement a Binary Search Tree using Linked Lists

C++Server Side ProgrammingProgramming

Here is a C++ program to Implement a Binary Search Tree using Linked Lists.

Functions and pseucodes

Algorithm

Begin
   Take the nodes of the tree as input.
   Create a structure nod to take the data d, a left pointer l and a right r as input.
   Create a function create() to insert nodes into the tree:
      Initialize c = 0 as number of nodes.
      Perform while loop till c < 6:
         Enter the root.
         Enter the value of the node, if it is greater than root then entered as right otherwise left.
   Create a function inorder() to traverse the node as inorder as:
      Left – Root – Right.
   Create a function preorder() to traverse the node as preorder as:
      Root – Left – Right.
   Create a function postorder() to traverse the node as preorder as:
      Left – Right – Root
   From main(), call the functions and print the result.
End

Example Code

 Live Demo

#include <iostream>
using namespace std;

struct nod {
   nod *l, *r;
   int d;
}*r = NULL, *p = NULL, *np = NULL, *q;

void create() {
   int v,c = 0;
   while (c < 6) {
      if (r == NULL) {
         r = new nod;
         cout<<"enter value of root node\n";
         cin>>r->d;
         r->r = NULL;
         r->l = NULL;
      } else {
         p = r;
         cout<<"enter value of node\n";
         cin>>v;
         while(true) {
            if (v< p->d) {
               if (p->l == NULL) {
                  p->l = new nod;
                  p = p->l;
                  p->d = v;
                  p->l = NULL;
                  p->r = NULL;
                  cout<<"value entered in left\n";
                  break;
               } else if (p->l != NULL) {
                  p = p->l;
               }
            } else if (v >p->d) {
               if (p->r == NULL) {
                  p->r = new nod;
                  p = p->r;
                  p->d = v;
                  p->l = NULL;
                  p->r = NULL;
                  cout<<"value entered in right\n";
                  break;
               } else if (p->r != NULL) {
                  p = p->r;
               }
            }
         }
      }
      c++;
   }
}

void inorder(nod *p) {
   if (p != NULL) {
      inorder(p->l);
      cout<<p->d<<endl;
      inorder(p->r);
   }
}

void preorder(nod *p) {
   if (p != NULL) {
      cout<<p->d<<endl;
      preorder(p->l);
      preorder(p->r);
   }
}

void postorder(nod *p) {
   if (p != NULL) {
      postorder(p->l);
      postorder(p->r);
      cout<<p->d<<endl;
   }
}

int main() {
   create();
   cout<<" traversal in inorder\n";
   inorder(r);
   cout<<" traversal in preorder\n";
   preorder(r);
   cout<<" traversal in postorder\n";
   postorder(r);
}

Output

enter value of root node
7
enter value of node
6
value entered in left
enter value of node
4
value entered in left
enter value of node
3
value entered in left
enter value of node
2
value entered in left
enter value of node
1
value entered in left
traversal in inorder
1
2
3
4
6
7
traversal in preorder
7
6
4
3
2
1
traversal in postorder
1
2
3
4
6
7
raja
Published on 04-Apr-2019 12:05:57
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