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C Program to Implement Binary Tree using Linked List

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C Program to Implement Binary Tree using Linked List

Problem Description

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.

C Program to Implement Binary Tree using Linked List - Source code
     
                
  /*
 * 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);
    }
}

Program Output

In-order Traversal:
D       B       H       E       A       F       C       G