1 #include <stdio.h> 2 #include <stdlib.h> 3 #include "bin-trees.h" 4 5 static void real_inorder(tree_ptr root)6real_inorder (tree_ptr root) 7 { 8 if (root == NULL) 9 return; 10 11 real_inorder (root->left); 12 printf ("%d ", root->data); 13 real_inorder (root->right); 14 } 15 16 void in_order_traverse(tree_ptr root)17in_order_traverse (tree_ptr root) 18 { 19 printf ("in-order traversal, with recursion: \n"); 20 real_inorder (root); 21 printf ("\n"); 22 } 23