This C Program implements binary tree using linked list. Binary Search tree is a binary tree in which each internal node x stores an element such that the element stored in the left subtree of x are less than or equal to x and elements stored in the right subtree of x are greater than or equal to x. This is called binary-search-tree property

Here is source code of the C Program to implement binary tree using linked list. The C program is successfully compiled and run on a Linux system. The program output is also shown below.

`/*`

`* C Program to Implement Binary Tree using Linked List`

`*/`

`#include <stdio.h>`

`#include <malloc.h>`

struct node {

struct node * left;

char data;

struct node * right;

};

struct node *constructTree( int );

void inorder(struct node *);

char array[ ] = { 'A', 'B', 'C', 'D', 'E', 'F', 'G', '\0', '\0', 'H' };

int leftcount[ ] = { 1, 3, 5, -1, 9, -1, -1, -1, -1, -1 };

int rightcount[ ] = { 2, 4, 6, -1, -1, -1, -1, -1, -1, -1 };

void main() {

struct node *root;

root = constructTree( 0 );

printf("In-order Traversal: \n");

inorder(root);

`}`

struct node * constructTree( int index ) {

struct node *temp = NULL;

if (index != -1) {

temp = (struct node *)malloc( sizeof ( struct node ) );

temp->left = constructTree( leftcount[index] );

temp->data = array[index];

temp->right = constructTree( rightcount[index] );

`}`

return temp;

`}`

void inorder( struct node *root ) {

if (root != NULL) {

inorder(root->left);

printf("%c\t", root->data);

inorder(root->right);

`}`

`}`

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```
$ cc pgm64.c
$ a.out
In-order Traversal:
D B H E A F C G
```

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