Driver program to test above functions
int main ( ) { struct node * root = newNode ( 1 ) ; root -> left = newNode ( 2 ) ; root -> right = newNode ( 3 ) ; root -> left -> left = newNode ( 4 ) ; root -> left -> right = newNode ( 5 ) ; printf ( " Preorder traversal of binary tree is " printPreorder ( root ) ; printf ( " Inorder traversal of binary tree is " printInorder ( root ) ; printf ( " Postorder traversal of binary tree is " printPostorder ( root ) ; getchar ( ) ; return 0 ; }