Mirror a Tree

Here is the recursive algorithm to mirror or swap the nodes:

/* change a tree so that the roles of the left
and right hand pointers are swapped at every node */
void mirror(Tree *r)
{
if(r == NULL) return;

Tree *tmp;
mirror(r->left);
mirror(r->right);

/* swap pointers */
tmp = r->right;
r->right = r->left;
r->left = tmp;
}

For other tree operations or complete code refer to : click here