C++ Program to Traverse binary tree in Preorder using Linked List

By | January 9, 2017

Traverse binary tree using Linked List


Write a C++ Program to Traverse binary tree in Preorder using Linked List. Here’s simple C++ Program to Traverse binary tree in Preorder using Linked List in C Programming Language.


What is Linked List ?


Linked list is a linear data structure that contains sequence of elements such that each element links to its next element in the sequence. Each link contains a connection to another link.

Following are the important terms to understand the concept of Linked List.

  • Link − Each link of a linked list can store a data called an element.
  • Next − Each link of a linked list contains a link to the next link called Next.

Each element in a linked list is called as “Node”. Each node consists of its own data and the address of the next node and forms a chain. Linked Lists are used to create trees and graphs.


Below is the source code for C++ Program to Traverse binary tree in Preorder using Linked List which is successfully compiled and run on Windows System to produce desired output as shown below :


SOURCE CODE : :


/*  C++ Program to Traverse binary tree in Preorder using Linked List  */

#include<iostream>
#include<stdlib.h>

using namespace std;

class node
{
public:
class node *left;
class node *right;
int data;
};
 
class tree: public node
{
public:
int stk[50],top;
node *root;
tree()
{
root=NULL;
top=0;
}
void insert(int ch)
{
	node *temp,*temp1;
	if(root== NULL)
	{
		root=new node;
		root->data=ch;
		root->left=NULL;
		root->right=NULL;
		return;
	}
	temp1=new node;
	temp1->data=ch;
	temp1->right=temp1->left=NULL;
	temp=search(root,ch);
	if(temp->data>ch)
		temp->left=temp1;
	else
		temp->right=temp1;
 
}
 
node *search(node *temp,int ch)
{
	if(root== NULL)
	{
		cout <<"no node present";
		return NULL;
	}
	if(temp->left==NULL && temp->right== NULL)
		return temp;
 
	if(temp->data>ch)
	     {  if(temp->left==NULL) return temp;
		search(temp->left,ch);}
	else
	      { if(temp->right==NULL) return temp;
	      search(temp->right,ch);
 
}              }
 
void display(node *temp)
{
	if(temp==NULL)
	 return ;
	display(temp->left);
       cout<<temp->data <<" ";
	display(temp->right);
}
void preorder( node *root)
{
	node *p,*q;
	p=root;
	q=NULL;
	top=0;
 
	while(p!=NULL)
	{
		cout <<p->data  << " ";
		if(p->right!=NULL)
		{
			stk[top]=p->right->data;
			top++;
		}
		p=p->left;
		if(p==NULL && top>0)
	{
		p=pop(root);
	}
	}
}
 
node * pop(node *p)
{
int ch;
ch=stk[top-1];
if(p->data==ch)
{
top--;
return p;
}
if(p->data>ch)
pop(p->left);
else
pop(p->right);
}
};
int main()
{
	tree t1;
	int ch,n,i;
	while(1)
	{
		cout <<"\n1.INSERT\n2.DISPLAY 3.PREORDER TRAVERSE\n4.EXIT\nEnter your choice:";
		cin >> ch;
		switch(ch)
		{
		case 1:   cout <<"enter no of elements to insert:";
			  cout<<"\n enter the elements";
			  cin >> n;
			  for(i=1;i<=n;i++)
			  {  cin >> ch;
			     t1.insert(ch);
			  }
			   break;
		case 2:   t1.display(t1.root);break;
		case 3:   t1.preorder(t1.root); break;
		case 4:   exit(1);
		}
	}
	return 0;
}

OUTPUT : :


/*  C++ Program to Traverse binary tree in Preorder using Linked List  */

1.INSERT
2.DISPLAY 3.PREORDER TRAVERSE
4.EXIT
Enter your choice:1
enter no of elements to insert:
 enter the elements5

6
2
4
9
8

1.INSERT
2.DISPLAY 3.PREORDER TRAVERSE
4.EXIT
Enter your choice:2
2 4 6 8 9 
1.INSERT
2.DISPLAY 3.PREORDER TRAVERSE
4.EXIT
Enter your choice:3
6 2 4 9 8 
1.INSERT
2.DISPLAY 3.PREORDER TRAVERSE
4.EXIT
Enter your choice:4
 
Exit code: 1

Above is the source code and output for C++ Program to Traverse binary tree in Preorder using Linked List which is successfully compiled and run on Windows System to produce desired output.

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