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DataStructure-Program to build a binary search tree from arrays.

#include <stdio.h>
#include <conio.h>
#include <alloc.h>
struct node
{
struct node *left ;
char data ;
struct node *right ;
} ;
struct node * buildtree ( int ) ;
void inorder ( struct node * ) ;
char arr[ ] = { 'A', 'B', 'C', 'D', 'E', 'F', 'G', '\0', '\0', 'H' } ;
int lc[ ] = { 1, 3, 5, -1, 9, -1, -1, -1, -1, -1 } ;
int rc[ ] = { 2, 4, 6, -1, -1, -1, -1, -1, -1, -1 } ;
void main( )
{
struct node *root ;
clrscr( ) ;
root = buildtree ( 0 ) ;
printf ( “In-order Traversal:\n” ) ;
inorder ( root ) ;
getch( ) ;
}
struct node * buildtree ( int index )
{
struct node *temp = NULL ;
if ( index != -1 )
{
temp = ( struct node * ) malloc ( sizeof ( struct node ) ) ;
temp -> left = buildtree ( lc[index] ) ;
temp -> data = arr[index] ;
temp -> right = buildtree ( rc[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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